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  • Polyurethane with tris(trimethylsiloxy)silyl propyl as the side chains: Synthesis and properties
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-21
    Xuecheng Yu; Ying Xiong; Chuanjun Zhou; Guihui Li; Shaozhi Ren; Zhen Li; Hongding Tang
    更新日期:2020-02-21
  • Highly conductive and thermally stable nanoparticle-conjugated polymer compounds through environmentally friendly in situ synthesis
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-21
    Swarup Biswas; Do-Kyung Kim; Il-Woo Nam; Muhan Choi; Jin-Hyuk Bae; Hyeok Kim
    更新日期:2020-02-21
  • Tribological properties of polyimide-graphene composite coatings at elevated temperatures
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-21
    Amit Roy; Liwen Mu; Yijun Shi

    This paper focuses on developing a polyamic acid (PAA) of polyimide (PI) and PI filled with graphene (PI/GP) on 100CR6 ESU hardened steel. The tribological testing result of the pure PI and PI/GP against 100Cr6 steel ball at room temperature (RT) and elevated temperatures (50 °C, 100 °C, 150 °C, 200 °C) exhibits that the addition of GP clearly enhances the friction reduction and wear-resistant properties of PI, due to the excellent lubricating properties of GP. The 3 wt % of GP content in the PI is the optimum loading for the lowest friction and wear at RT and elevated temperatures. The SEM analysis of the worn surfaces showed that the high wear-resistant of the PI/GP composite is due to the generation of the loose particles from the coating surfaces which could be embedded on the friction pairs and rolled over there as a lubrication film. Also, at 60 % weight residue the PI/3 G P showed the high decomposition temperature.

    更新日期:2020-02-21
  • Preparation and characterization of lysozyme@carbon nanotubes/waterborne polyurethane composite and the potential application in printing inks
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-21
    Xing Zhou; Jingrui Deng; Changqing Fang; Ruien Yu; Wanqing Lei; Xinyu He; Chaoqun Zhang
    更新日期:2020-02-21
  • Multistage resistive switching behavior organic coating films-based of memory devices
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-21
    Yanmei Sun; Dianzhong Wen

    Memory devices were prepared by spin-coating process, and the multistage resistive switching behavior has been found in organic coating films-based of memory device. The composite of [6,6]-phenyl C61-butyric acid methyl ester and polyvinyl pyrrolidone were used as active layer materials. The as-prepared device exhibits a typical nonvolatile write-once-read-many- times storage effect, and shows multistate resistive switching behavior, and there are obvious distinctions between different resistance states. The resistance in low resistance state (LRS) and high resistance state (HRS) dependence on temperature is tested, and the resistance of LRS and HRS show metal and semiconductor characteristics, respectively. As well as, the resistance in HRS shows evident dependence on cell size. Hence, the resistive switching mechanism was attributed to the broken processes of carbon-rich conducting filament. Furthermore, conductance quantization during resistive switching processes was analyzed. This work might make it attractive for exploiting high density data storage.

    更新日期:2020-02-21
  • Naphthyl-based acylphosphine oxide photoinitiators with high effiency and low migration
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-20
    Yaoyao Liu; Tingting Wang; Chuanbao Xie; Xiujuan Tian; Liang Song; Lei Liu; Zhongwei Wang; Qing Yu
    更新日期:2020-02-21
  • Preparation of water-borne non-fluorinated anti-smudge surfaces and their applications
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-07
    Ximing Zhong; Meng Zhou; Sheng Wang; Heqing Fu

    Existing approaches for the preparation of anti-smudge surfaces are prominently confined to the use of fluorinated materials and highly toxic organic solvents. Smooth water-borne non-fluorinated anti-smudge surfaces are highly desirable for their high safety, low cost and environmental friendliness, and they could also address the challenges plagued by the deficiencies in long-term stability, durability, and scalability existing in present coating systems. Herein, we, for the first time, develop a novel smooth non-fluorinated anti-smudge system by crosslinking the hydrophilic groups in two water-borne components. The resultant surfaces are highly transparent, and they show striking anti-smudge performance toward various liquids, including water, hexadecane, diiodomethane, decane, ethanol, etc. Besides, these surfaces demonstrate remarkable chemical shielding ability against acid solution and alkali solution and thus protect substrates against exposure to harsh chemical environments. Also, they exhibit self-healing ability against chemical and physical damages. Compared with commercial fluorinated amphiphobic surface and superhydrophobic surface, these non-fluorinated surfaces show incomparable advantages in anti-smudge performance, pump oil and crude oil droplets could slide off the surface without leaving any traces. Furthermore, these surfaces could be applied for anti-graffiti and anti-fingerprint purposes due to their outstanding anti-smudge performance toward water-borne and oil-borne paints, ink, and artificial fingerprint liquid. More strikingly, they could maintain anti-smudge performance even after being subjected to long-term UV irradiation and physical damages, such as impact and scratch, indicative of the remarkable weathering resistance and the outstanding mechanical durability of these coating surfaces. Therefore, excellent performances in addition to the cost-effective and environmentally-friendly features make these newly-developed smooth water-borne non-fluorinated anti-smudge surfaces promising for widespread applications.

    更新日期:2020-02-20
  • Effects of low-melting glass powder on the thermal stabilities of low infrared emissivity Al/polysiloxane coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-07
    Lun Qi; Xiaolong Weng; Biao Wei; Le Yuan; Gang Huang; Xingbo Du; Xueyu Wu; Hongxing Liu

    In this study, low infrared emissivity coatings with good thermal stabilities were fabricated using silicone resin as adhesive, flake aluminum powder as pigment, and low-melting glass powder as functional filler. The effects of the low-melting glass powder on the adhesions, thermal expansions, and infrared emissivity of the coatings were systematically investigated. In addition, the surface microstructures and thermal stability mechanisms of the coatings were analyzed in detail. Mechanical tests showed that the addition of the low-melting glass powder to the Al/polysiloxane coating enhanced its adhesion after a high-temperature treatment due to the mechanical interlocking of the particles by the secondary film-forming low-melting glass. Thermal analysis indicated that the oxidation resistance of the coating could be improved by the film-forming low-melting glass powder. The low-emissivity coating with a low-melting glass powder content of approximately 15 wt.% and Al/polysiloxane ratio of 1.5 exhibited good thermal stability. The adhesion of the coating increased to 9.0 ± 0.4 MPa after heating at 500 °C. When the content of the low-melting glass was increased from 0 to 15 wt.%, the oxidation exothermic peak of the coating shifted from 590 to 625 °C at a pigment/binder ratio of 1.5. The infrared emissivity of the coating was 0.25 after heating at 600 °C.

    更新日期:2020-02-20
  • 更新日期:2020-02-20
  • Functionalized nanosilica as an antimicrobial additive for waterborne paints
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-12
    P. Dileep; Sinto Jacob; Sunil K. Narayanankutty

    Waterborne paints are sensitive to humidity and susceptible to microbial attack. To prevent aesthetic bio-deterioration, biocides are used. Some of these biocides leach out from paint film during aging. In this paper, we report the use of functionalized nanosilica as a non-leaching biocide. We used nanosilica (NS), nanosilica modified with p-nitrophenol (PNP-NS) and silica fume (SF) as antimicrobial agents in commercial waterborne paint at 0.5–2.5 % of total solid content in paint. It was observed that 2 % PNP-NS improved the antifungal properties by 100 % and 13 % compared to the control sample and commercial antifungal paint, respectively while the antibacterial property was improved by 50 % and 19 %, respectively. The algal defacement test showed more predominant values for paint with PNP-NS compared to paint with NS, SF, and commercial antifungal paint. The X-cut adhesion, hardness, opacity and water resistance of the dry paints were evaluated after application. The viscosity and opacity of paint films were not much affected by the additives NS and PNP-NS upto 2 %. Improved X-cut adhesion, hardness and water resistance were achieved with NS and PNP-NS. This study demonstrates that NS and PNP-NS are good additives to improve the antifungal and antibacterial properties of waterborne commercial paints.

    更新日期:2020-02-20
  • Polyethylenimine-assisted exfoliation of h-BN in aqueous media for anticorrosive reinforcement of waterborne epoxy coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-12
    Hongyi Shi; Weiqu Liu; Chunhua Liu; Maiping Yang; Yankun Xie; Shuo Wang; Fengyuan Zhang; Liyan Liang; Ke Pi

    Herein, h-BN powders were sonicated in an aqueous solution of polyethylenimine (PEI) to simultaneously exfoliate and functionalize h-BN nanosheets with Lewis acid-base interaction. The structure and morphology of PEI modified h-BN nanosheets (PEI-BNNSs) were characterized by FTIR, TGA, AFM and TEM. The as-prepared PEI-BNNSs were served as anticorrosive nanofillers for waterborne epoxy (EP) coatings on Q235 carbon steel. The corrosion behaviors of EP and PEI-BNNSs/EP coating systems in 3.5 wt % NaCl aqueous solution were evaluated by electrochemical workstation. It is worth noting that the protection efficiency (PE) values of 1 wt % PEI-BNNSs/EP and 2 wt % PEI-BNNSs/EP coating systems are as high as 99.99 % compared to EP coating systems. Moreover, the impedance modulus (|Z|f = 0.01 Hz) of the 1 wt % PEI-BNNSs/EP coating system was 3–4 orders of magnitude higher than the EP coating after 90 days of immersion. The electrochemical results revealed that PEI-BNNSs can significantly enhanced the corrosion resistance of waterborne epoxy coatings.

    更新日期:2020-02-20
  • Waterborne polyurethanes from castor oil-based polyols for next generation of environmentally-friendly hair-styling agents
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-12
    Yi Zhang; Wenbo Zhang; Xiao Wang; Qianwen Dong; Xueyi Zeng; Rafael L. Quirino; Qiming Lu; Qingwen Wang; Chaoqun Zhang
    更新日期:2020-02-20
  • A novel organic-inorganic zwitterionic acrylate polymer for high-performance anti-fog coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-12
    Ziyang Zheng; Yuping Liu; Li Wang; Li Yu; Yuan Cen; Tingting Zhu; Danmei Yu; Changguo Chen
    更新日期:2020-02-20
  • Synthesis of VO2/Poly(MMA-co-dMEMUABr) antimicrobial/thermochromic dual-functional coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-14
    Yixian Liu; William Z. Xu; Paul A. Charpentier

    In order to address the need for window coatings that can control room temperature while being self-cleaning, this work examined a dual-functional antimicrobial/thermochromic coating. The goal was addressed by chemically polymerizing the antimicrobial agent, quaternary ammonium compound (QAC) N,N-dimethyl-N-{2-[(2-methylprop-2-enoyl)oxy]ethyl}undecane-1-aminium bromide (dMEMUABr) while using vanadium dioxide (VO2) as the thermochromic agent. The antimicrobial agent dMEMUABr, having an acrylic moiety and a long hydrocarbon tail for enhanced killing, was synthesized and characterized by NMR and FTIR spectroscopies. VO2 nanoparticles were synthesized hydrothermally and characterized by physicochemical analysis including powder XRD, DSC and SEM. Polymer coatings were obtained by polymerizing dMEMUABr with methyl methacrylate (MMA) monomer under UV irradiation with the required UV curing time being investigated. Thermochromic performance of dual-functional VO2/poly(MMA-co-dMEMUABr) coating gave an infrared modulation ΔTIR of 5.8 % and luminous transmittance Tlum of 36.1 % at 25 °C. The antimicrobial testing of the dual-functional coating indicated that it could kill 90.3 % of bacteria Escherichia coli (E. coli) within 24 h at a low dMEMUABr concentration (3.8 wt % relative to MMA). The zone of inhibition test proved the contact kill principle of the coating, without releasing toxic antimicrobial agents to the environment.

    更新日期:2020-02-20
  • 更新日期:2020-02-20
  • Dispersion state of TiO2 pigment particles studied by ultra-small-angle X-ray scattering revealing dependence on dispersant but limited change during drying of paint coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-18
    David Löf; Guillaume Hamieau; Michael Zalich; Pascal Ducher; Søren Kynde; Søren R. Midtgaard; Claire F. Parasida; Lise Arleth; Grethe V. Jensen
    更新日期:2020-02-20
  • Organosilane-functionalized hydrothermal-derived coatings on titanium alloys for hydrophobization and corrosion protection
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-19
    S. Rahimipour; B. Rafiei; E. Salahinejad

    This work focuses on the structure, wettability and corrosion behaviors of Ti-6Al-4 V alloy after roughening treatments in different concentrations of NaOH aqueous solutions followed by low surface energy hexadecyltrimethoxysilane (HDTMS) coating. In this regard, scanning electron microscopy, contact angle measurements, potentiodynamic polarization and electrochemical impedance spectroscopy were used to characterize the samples. In contrast to hydrophilicity caused by the hydrothermal alkaline treatments, the subsequent HDTMS coating donated considerable hydrophobicity. Typically, the highest sessile water contact angle (about 147°) was obtained for the sample treated in 3 M NaOH solution followed by the HDTMS coating. In addition, the alkaline treatment reduced the corrosion resistance of the surface in a NaCl aqueous solution; however, the HDTMS hydrophobization process improved it significantly. It is eventually concluded that the coupled use of alkaline treatment and HDTMS functionalization can be further considered for moisture-exposed applications of Ti-based alloys.

    更新日期:2020-02-20
  • 更新日期:2020-02-20
  • Experimental and computational study of penicillamine drug and cysteine as water-soluble green corrosion inhibitors of mild steel
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-06
    Razieh Farahati; S. Morteza Mousavi-Khoshdel; Ali Ghaffarinejad; Hadi Behzadi

    Cysteine amino acid is well known as an effective green corrosion inhibitor. Due to the structural similarity between d-penicillamine (PA) drug and cysteine, it is expected PA also acts as a green corrosion inhibitor. Herein we describe the corrosion inhibition ability of PA and l-cysteine (Cys) on the mild steel in 1 M HCl using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). Experiments were performed in various concentrations of Cys and PA and different immersion times. The results suggested that both Cys and PA can be used as effective corrosion inhibitors. PA and Cys are mixed-type inhibitors; however, PA affected significantly only the cathodic reaction. The adsorption of inhibitors followed the Langmuir adsorption isotherm. Electronic structure of Cys and PA was elucidated with density functional theory (DFT) calculations. Molecular adsorption on Fe(110) was investigated using molecular dynamics (MD) simulations.

    更新日期:2020-02-20
  • Antimicrobial cationic acrylate-based hybrid coatings against microorganism contamination
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-04
    Fawei Wang; Bin Wang; Xuemei Li; Zhanmin Wu; Yufeng He; Pengfei Song; Rongmin Wang
    更新日期:2020-02-06
  • Modified salicylaldehyde@ZIF-8/graphene oxide for enhancing epoxy coating corrosion protection property on AA2024-T3
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-04
    Liangliang Xiong; Mei Yu; Yingquan Li; Xiangxin Kong; Songmei Li; Jianhua Liu

    [email protected]/graphene oxide (SZG) nanosheets were fabricated by anchoring [email protected] nanoparticles on graphene oxide. SZG nanosheets were modified by amino silane 3-aminopropyltriethoxysilane (f-SZG) to improve the compatibility with epoxy coating. Sedimentation test showed the excellent dispersion stability of f-SZG in resin epoxy even after standing for 480 h. The cross-sectional microstructure of coatings implied the strong f-SZG/coating matrix interface by transforming the cleavage fracture to the ductile. Additionally, the stimuli-responsive release to H+ and Al3+ ions of f-SZG is maintained after the silanization. Compared with other samples, f-SZG0.5 epoxy coatings show the optimal long-term corrosion protection property with the lowest reduction rate of |Z|0.01Hz (13.6%) after 480 h immersion and the intact surface after 27d salt spray test due to the stronger interfaces of f-SZG/epoxy matrix and coating/substrate, the proper content (0.5 wt.%) and the enhanced cross-linked density of coating.

    更新日期:2020-02-06
  • 更新日期:2020-02-04
  • 更新日期:2020-02-04
  • A novel slippery surface with enhanced stability and corrosion resistance
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-03
    Sicheng Yuan; Xiguang Zhang; Dan Lin; Fei Xu; Yuan Li; Huaiyuan Wang
    更新日期:2020-02-03
  • Anti-scaling of superhydrophobic poly(vinylidene fluoride) composite coating: Tackling effect of carbon nanotubes
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-02-01
    Huijuan Qian; Mingliang Zhu; Hua Song; Huaiyuan Wang; Zhanjian Liu; Chijia Wang
    更新日期:2020-02-03
  • A review on fundamentals, constraints and fabrication techniques of superhydrophobic coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-31
    Amrita Hooda; M.S. Goyat; Jitendra Kumar Pandey; Adesh Kumar; Rajeev Gupta

    Over the past two decades, scientific communities and coating manufacturers have presented superhydrophobic coatings for various applications such as automotive, marine, medical, and energy sectors, etc [1]. Worldwide, researchers reported the fundamentals, fabrication techniques [2] and applications of superhydrophobic coatings. But, most of the reported reviews provided the limited information on fundamentals and fabrication techniques of the superhydrophobic coatings and found more directed towards the applications of superhydrophobic coatings in different sectors [[2], [3], [4], [5], [6]]. But, this review presents a detailed description of the fundamentals of superhydrophobic coatings, problems in manufacturing such coatings and the fabrication techniques. Additionally, this review provides a glimpse of potential applications of such coatings. The major constraints to the development of superhydrophobic coatings are identified as the expensive superhydrophobic materials, nano feature durability, coating stability, precipitation/condensation problem, impact problem and emulsifier/oil wetting problem, etc. The best fabrication techniques of superhydrophobic coatings are identified as the sol-gel, wet-chemical, electrochemical deposition and Mussel-inspired chemistry. In future, the optimization of the control parameters of such processing routes is highly desired to develop the advanced superhydrophobic coatings for various applications.

    更新日期:2020-02-03
  • Synergistic functionalization of h-BN by mechanical exfoliation and PEI chemical modification for enhancing the corrosion resistance of waterborne epoxy coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-30
    Youqing Wu; Yi He; Taigang Zhou; Chunlin Chen; Fei Zhong; Yunqing Xia; Peng Xie; Chen Zhang

    The hexagonal boron nitride (h-BN) has extensive promise for metal corrosion protection due to its good impermeability to gas and liquid. However, the practical application of h-BN in polymer composites is limited by surface incompatibility. Herein, we prepared a homogeneous dispersion of h-BN in water-borne epoxy (EP) matrix by mechanical exfoliation and chemical modification, in which the h-BN powder was ultrasonic to obtain partially hydroxylated BN and the products were modified with water-soluble branched poly-ethyleneimine (PEI) via Lewis acid-base interaction. The electrochemical test (EIS and potentiodynamic polarization) and salt spray test in NaCl solution were used to analyze the corrosion resistance performance of composite coatings. The results show that PEI-BNNS/EP coating has superior and long-term anticorrosion performance for P110 mild steel. The impedance modulus (Zf = 0.01 Hz) of PEI-BNNS/EP still has 6.63 × 107 Ω cm2 after 70 days immersion in the 3.5 wt. % NaCl solution. The PEI has an important role for enhancing the anticorrosion property of PEI-BNNS/EP coating, which increases the dispersibility and compatibility of h-BN in EP and the crosslink density of epoxy resin. Our study gives a strategy for the preparation of easy dispersion h-BN nanosheets in large quantities, thus broadening its practical application in the polymer material field.

    更新日期:2020-01-31
  • Hydrophilic and antibacterial surface functionalization of polyamide fabric by coating with polylysine biomolecule
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-31
    Wen Zhang; Jin-Xing Li; Ren-Cheng Tang; Ai-Dong Zhai
    更新日期:2020-01-31
  • A better understanding of failure process of waterborne coating/metal interface evaluated by electrochemical impedance spectroscopy
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-31
    Dongdong Song; Hongxia Wan; Xiaohui Tu; Wei Li

    Cathodic delamination—weakening or loss of adhesion between the coating and the metal—is one of the major failure processes of organic coatings. Generally, it is almost inevitable to introduce defects to the coating during processing and operation. In this work, the delamination process of coatings around defects and the corrosion in defective coated metals was elucidated using immersion and electrochemical impedance tests. Two types of coatings (styrene-acrylic coating and terpolymer coating) were compared. The effects of defect size, chloride ion concentration and resin type on cathodic delamination were investigated. A small defect may affect the metal corrosion. Increasing the chloride ion concentration can promote the corrosion of metal but may not accelerate the delamination of the coating. The resin type is the key factor in the failure process of the coating.

    更新日期:2020-01-31
  • Robust icephobic epoxy coating using maleic anhydride as a crosslinking agent
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-31
    Jian Lv; Chenxi Zhu; Haonan Qiu; Jing Zhang; Changdong Gu; Jie Feng
    更新日期:2020-01-31
  • Facile fabrication of biomimetic superoleophobic composite coating via Schiff base reaction and self-assembly
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-31
    Guolin Zheng; Dan Zhang; Chuang Zheng; Yajuan Yao; Zhu Long

    Inspired by the defects of superoleophobic surface with poor friction resistance and the complicated preparation method, the bio-dopamine was utilized and the friction-durable superoleophobic composite coating was successfully obtained via Schiff base reaction and self-assembly. Dopamine contains the phenolic hydroxyl groups that can react with an amine group or a thiol group. Polydopamine is formed via dopamine self-polymerization under aerobic and weakly alkaline conditions. Additionally, polydopamine can adhere to the surface of virtually all materials. First, the self-polymerization of folic acid induced dopamine to form polydopamine micro-nanoparticles under weakly alkaline conditions. Second, 3,5-Bis(trifluoromethyl)aniline reacted with the phenolic hydroxyl groups of polydopamine nanoparticles via Schiff base reaction. Ammonium hexafluorosilicate was adsorbed on the surface of polydopamine microspheres via electrostatic interactions. Then, the self-assembly behavior of fs-81 and fs-63 with ammonium hexafluorosilicate occurred on polydopamine nanoparticles via electrostatic interactions. Accordingly, the surface roughness was further increased, for which the limitation of traditional methods of using additional nanoparticles to construct hierarchical rough surface was broken. Eventually, the superoleophobic composite coating was applied to the surface of cotton fabric. The results showed that the contact angles of the cotton fabric surface with edible oil, ethylene glycol and glycerol were greater than 150° in the air, respectively, after two cycles of self-assembly modification. The contact angles between the cotton fabric surface and edible oil droplets were still greater than 150°after 25 mechanical abrasion cycles. In addition, the surface free energy of cotton fabric was decreased by 64.1 % after finishing the coating.

    更新日期:2020-01-31
  • Preparation and characterization of self-matting waterborne polymer–An overview
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-29
    Taoling Xie; Weiyao Kao; Liying Sun; Junchao Wang; Guochen Dai; Zhengjun Li

    The matt waterborne coating possesses the characteristics of green environmental protection, soft luster and broad application. At present, achieving the matting effect of the coating is mainly by adding external matting agent into the formula or synthesizing self-matting polymer. On account of the defects produced by adding external matting agent like lowering the emulsion stability, fabricating self-matting waterborne polymer with excellent properties has drawn increasing attention. In this paper, strategies for obtaining matting effect and the factors affecting glossiness were firstly introduced. In order to synthesize self-matting waterborne polymer with good matting performance, the methods for constructing surface roughness and the design of membrane phase component materials, which were the two important aspects governing the matting performance of waterborne self-matting polyurethane and acrylic polymer were reviewed subsequently in detail. In addition, the evaluation of matting performance, and characterization of surface roughness and membrane phase structure were summarized. Last but not least, the development trend of self-matting waterborne polymer was prospected.

    更新日期:2020-01-29
  • Fabrication and anti-corrosion properties of melamine-treated graphene oxide adsorbed on copper
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-27
    Yue Li; Hui Yang; Fengqi Wang; Yong Huang
    更新日期:2020-01-27
  • Unveiling the origin of the anti-fogging performance of plasma-coated glass: Role of the structure and the chemistry of siloxane precursors
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-25
    Iván Rodríguez Durán; Jacopo Profili; Luc Stafford; Gaétan Laroche

    The application of (super)hydrophilic coatings in sectors of activity concerned by fogging, such as the food industry, the architectural sector, and medicine has attracted enormous attention over the past few years. However, despite this interest, most of the coating deposition techniques used thus far are not suitable for large-scale production because of their multistep nature. In this regard, the use of atmospheric pressure dielectric barrier discharges (AP-DBD) operated under a controlled N2/N2O atmosphere offers a promising alternative to conventional deposition techniques for the fabrication of anti-fogging coatings. Using this one-step coating approach, four siloxane precursors with different structures and different number of Si―H and Si−CH3 groups; namely, 1,3,5,7-tetramethylcyclotetrasiloxane (TMCTS), octamethylcyclotetrasiloxane (OMCTS), 1,1,3,3-tetramethyldisiloxane (TMDSO), and hexamethyldisiloxane (HMDSO) were deposited on glass samples. Because of their extreme wetting behavior (WCA < 5°), TMCTS-coated glasses featured an excellent anti-fogging performance, in contrast to OMCTS-, TMDSO-, and HMDSO-coated glasses which were not fogging-resistant (WCA ≈ 80°)). Coupled with hydrophilic functionalities, such as CO, O CO, and SiOH groups, the relatively high surface roughness of TMCTS-coated glass, compared with that of OMCTS-, TMDSO-, or HMDSO-coated glass, accounted for its superior visual characteristics when exposed to water vapor at 80 °C. These results allow us to confidently conclude that the cyclic structure of TMCTS in conjunction with the high reactivity of the Si-H bonds is responsible for the observed anti-fogging effect.

    更新日期:2020-01-26
  • Formation of polymer-like anticorrosive films based on organosilanes with benzotriazole, carboxylic and phosphonic acids. Protection of copper and steel against atmospheric corrosion
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-24
    Natalia Gladkikh; Yuriy Makarychev; Alexander Chirkunov; Alexey Shapagin; Maxim Petrunin; Ludmila Maksaeva; Marina Maleeva; Tatyana Yurasova; Andrey Marshakov

    A technique has been developed to create polymer-like protective layers on metal surfaces from aqueous solutions of organosilanols with benzotriazole, carboxylic or phosphonic acids. Using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM), it was shown that the introduction of hydroxyethylidene diphosphonic or citric acids into the inhibitor formulations leads to the formation of a multilayer polymer-like film on the metal surface. Electrochemical and corrosion tests (a technique of the polarization resistance and exposure of samples in the salt spray chamber) demonstrated the effectiveness of the formed multilayer films on metals to protect steel and copper against atmospheric corrosion.

    更新日期:2020-01-24
  • A new hybrid waterborne polyurethane coating synthesized from natural rubber and rubber seed oil with grafted acrylate
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-23
    Nathapong Sukhawipat; Wanida Raksanak; Ekwipoo Kalkornsurapranee; Anuwat Saetung; Nitinart Saetung
    更新日期:2020-01-23
  • 更新日期:2020-01-23
  • Preparation of copper-cobalt-nickel ferrite/graphene oxide/polyaniline composite and its applications in microwave absorption coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Jie Sun; Liming Wang; Qun Yang; Yong Shen; Xiao Zhang

    A copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was prepared by a two-step method. The prepared tri-composite was used as the absorbing agent and waterborne-polyurethane as matrix which coated on cotton fabric to prepare a flexible absorbing material. The absorbing property and electromagnetic shielding performance of the coated fabrics were studied by scanning electron microscope (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), anti-electromagnetic radiation and vector network analyzer. Compared with polyaniline and graphene oxide, the microwave absorption capacity of the copper-cobalt-nickel ferrite/graphene oxide/polyaniline tri-composite was significantly enhanced, which can achieve to -33 dB at 10.8 GHz. When the content of coating agent was 40 % and thickness of the coated fabric was 2.0 mm, the shielding performance could reach -47 dB in the frequency of 300 kHz to 3.0 GHz. Meanwhile, the mechanical property was better than that of uncoated cotton fabric.

    更新日期:2020-01-23
  • 更新日期:2020-01-23
  • The influence of hydrofluoric acid doped polyaniline on the protective performance of a mg-rich epoxy coating on AZ91D magnesium alloy
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Xingguo Feng; Chao Zhu; Xiangyu Lu; Zhang Yiji; Tong Wu; Yu Zuo; Xuhui Zhao; Yuchao Dun; Mai Wang

    Hydrofluoric acid doped PANI (PANI-HF) particles were added to a magnesium (Mg)-rich primer (MRP) on AZ91D Mg alloy and the influence of the particles on the primer was investigated. The optimal PANI-HF particle content was 1 wt.%. These particles improved the electrical contact between Mg particles and the AZ91D substrate, thereby enhancing the cathodic protection. Subsequently, the products of Mg particles (MgO and MgF2) precipitated in the coating and improved the barrier effects. Moreover, PANI captured some chloride ions, thereby reducing degradation of the coating. Eventually, the protective film formed on the AZ91D substrate blocked the electrolyte permeation, retarding the corrosion of the substrate.

    更新日期:2020-01-22
  • Chemical modification of graphene oxide to reinforce the corrosion protection performance of UV-curable polyurethane acrylate coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Yanjun Ma; Yinping Ye; Hongqi Wan; Lei Chen; Huidi Zhou; Jianmin Chen
    更新日期:2020-01-22
  • Oil-repellent and antifog coatings based on poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Shuai Luo; Xiao-Xi Peng; Yun-Fei Zhang; Ping Fu; Fei-Peng Du

    In order to improve the oil-repellent and antifouling ability of the antifog coatings, a poly(vinyl alcohol)/hydrolyzed poly (styrene-co-maleic anhydride)/fluorocarbon surfactant (PVA/H-PSMA/FC) was prepared by incorporating a fluorocarbon surfactant into PVA/H-PSMA via hydrogen bonds. The microstructure, antifog and oil-repellent properties were investigated in our study, and the results indicate that the strong interaction between the PVA/H-PSMA and the FC provides a good fixation for the FC inside or on the surface of the coatings. The water contact angle (WCA) ranges from 59° to 69° and the oil contact angle (OCA) ranges from 35° to 50°, which means that the PVA/H-PSMA/FC coatings are hydrophilic and oleophilic. The results also demonstrate that the prepared PVA/H-PSMA/FC coating exhibits excellent antifog properties and high transparency. Moreover, the oil droplets may slip off the coating surface without any residue and the glide angle is below 12°. A low content of FC loaded creates a large space between FC molecules, thus providing enough hydrophilicity on the PVA/H-PSMA surface and achieving excellent antifog performance. Meanwhile, the mobile fluorinated alkyl chains on the surface can be reorganized and act as “slides” to easily move oil droplets at low TA, providing oil repellency. The excellent oil-repellency makes the transparent PVA/H-PSMA/FC antifog coatings have potential application prospects in the field of surface protection of optical equipment and solar panel.

    更新日期:2020-01-22
  • Preparation and UV aging of nano-SiO2/fluorinated polyacrylate polyurethane hydrophobic composite coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Fuying Yu; Ju Gao; Canpei Liu; Yaokun Chen; Gang Zhong; Chris Hodges; Mingfeng Chen; Huagui Zhang
    更新日期:2020-01-22
  • Self-healing of chemically bonded hybrid silica/epoxy for steel coating
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-22
    Ayman M. Atta; Abdelrahman O. Ezzat; Ashraf M. El-Saeed; Ahmad M. Tawfeek; Nourah I. Sabeela

    New amino-functionalized smart silica composites and nanoparticles were prepared from hydrolyzing microgel based on N-isopropylacrylamide-co-vinyltrimethoxysilane (NIPAM-VTS) with tetraethoxysilane (TEOS) and 3-aminopropyltriethoxysilane (APTS). The chemical structure, morphology, particle sizes, and thermal stability were evaluated and proved that the amino group contents were increased on the surfaces of silica composites more than that modified after calcination at 700 °C. The amino-functionalized calcined silica nanoparticles and NIPAM-VTS-polysiloxane were found to show better dispersion capability than silica NPs particles existed in the epoxy hybrid coatings. The amino-functionalized hybrid silica epoxy coatings were found to be much superior in the adhesion, mechanical testing and corrosion protection over those of hybrid materials without amino-functionalization. The amino-functionalized NIPAM-VTS-polysiloxane shows new self-healing performance when blended with epoxy matrix at weight content equals or above 6 Wt. % after exposure to salt spray humidity of seawater. The self-healing performance may have probably resulted from the salt sensitivity of amino-functionalized NIPAM-VTS-polysiloxane composite and enhancement of the adhesion strength due to the formation of Fe O Si and Fe NH Si covalent bonds at the interface of epoxy coating.

    更新日期:2020-01-22
  • Synthesis and photopolymerization of novel UV-curable macro-photoinitiators
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-21
    Lin Deng; Liuyan Tang; Jinqing Qu

    The design and development of macro-photoinitiators applicable to UV system has been attracted increasing attention for their excellent performance of low migration and high compatibility. Herein, four kinds of novel macro-photoinitiators (PI1-PI4) used in UV-curable coatings were synthesized by different isocyanates, 1-hydroxycyclohexyl phenyl ketone (Irgacure 184), 2-hydroxyethyl methacrylate (HEMA) and pentaerythritol triacrylate (PETA). The structures were analyzed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). Moreover, the photopolymerization kinetics of the macro-photoinitiators were investigated by real-time FTIR. Results revealed that the macro-photoinitiators display higher curing efficiency, lower migration performance and better compatibility with formulation compositions compared to Irgacure 184. On the other hand, the macro-photoinitiators also served as self-initiating oligomers and had good thermal stability with 10 % weight loss temperatures (T10 %) above 299.7 °C. The UV-cured films consisting of oligomers and tripropylene glycol diacrylate (TPGDA) showed excellent physical properties and high curing efficiency and rapid curing rate.

    更新日期:2020-01-22
  • Polyurethane modified epoxy acrylate resins containing ε-caprolactone unit
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-16
    Yang Xu; Jing Luo; Xiaoya Liu; Ren Liu

    Epoxy acrylate resins modified by polyurethane with excellent mechanical properties play a crucial role in UV-curable coatings, but the high viscosity limits their further applications in 3D printing, electronic packaging material. In this work, a series of polyurethane modified epoxy acrylate resins containing various ε-caprolactone unit content were successfully synthesized to reduce the viscosity of polyurethane modified epoxy acrylate resins. The chemical structure and molecular weight of the prepared resins were characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance spectroscopy (1H NMR) and gel permeation chromatography (GPC), respectively. The influences of ε-caprolactone unit on the viscosity of resins and double bond conversion of cured films were studied. The dynamic thermomechanical properties, mechanical properties, thermal stability and basic properties of UV curable coatings were also evaluated. The results show that the viscosity of resins is reduced by two orders of magnitude. As the ε-caprolactone unit content increased, the adhesive force increased from 0B to 5B according to ASTM D3359, while the glass transition temperatures (Tg) of films and pencil hardness were slightly lower than those of the conventional polyurethane modified epoxy acrylate resins. In summary the introduction of ε-caprolactone unit in the side chain enables the preparation of polyurethane modified epoxy acrylate resin with ultralow viscosity as well as a more comprehensive adhesive and impact force performance.

    更新日期:2020-01-17
  • Anticorrosion behavior of DBSA doped polyaniline nanoparticles/epoxy ester coating on carbon steel in saline-alkaline solution
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-17
    Mohsen Rayati; Reza Arefinia

    Anticorrosion coatings based on epoxy ester containing different concentrations of dodecyl benzene sulfonic acid doped polyaniline nanoparticles (nPAni(DBSA)) were prepared and applied on the carbon steel surface. The corrosion behavior of this system in saline-alkaline solution (3.5% NaCl and pH 9) was studied using electrochemical impedance spectroscopy (EIS) during 100 days immersion. At the end of immersion, the metal/coating interface was analyzed using scanning electron microscopy (SEM) and Raman spectroscopy. The obtained results showed that nPAni(DBSA) particles could efficiently improve the anticorrosion performance of the epoxy ester coating through both the barrier and the active mechanisms where the best corrosion inhibition of carbon steel was attained at 1.5% of nPAni(DBSA). The active inhibition of nPAni(DBSA) is attributed to the formation of a secondary passive layer at the metal/coating interface.

    更新日期:2020-01-17
  • Assessment of protection treatments for carbonatic stone using nanocomposite coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-13
    Vincenzo Renda; Monica Alvarez De Buergo; Maria Luisa Saladino; Eugenio Caponetti

    In this paper the effect of the application of four kinds of polymer dispersions containing nanoparticles, used as protectives, on two type of carbonatic lithotypes, White Noto and Comiso stone, is reported. The study was conducted by analysing the contribution of each component of the system. After the structural characterization of the coating itself, the performance of those colloidal systems has been studied upon application on the calcarenites, preferring non-invasive techniques and microdestructive techniques. Effect of the nanoparticles presence on hydrorepellency and roughness of the stone surface and on chromatic changes has also been considered. The tests conducted have proven that although some of the formulations present some issues for their usage on White Noto stone, all four formulations induce an effective waterproofing action on Comiso stones, even in presence of TiO2 and SiO2 nanoparticles.

    更新日期:2020-01-14
  • Effect of polyether/polyester polyol ratio on properties of waterborne two-component polyurethane coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-09
    Shiyu Li; Zhiyong Liu; Lijie Hou; Yang Chen; Tonghui Xu

    In order to obtain waterborne two-component polyurethane (WB 2K-PUR) with good mechanical properties as well as excellent corrosion resistance, a series of hydroxyl-based polyurethane (HO-WPU) were synthesized using isophorone diisocyanate (IPDI), dimethylolpropionic acid (DMPA), and different proportions of polyether polyol (PTMEG) and polyester polyol (P1012) in this paper. Then WB 2K-PUR coatings were prepared with water-dispersible isocyanates (WDPI) as curing agent. The influence of the proportion of polyester polyols and polyether polyols in soft segments on coatings properties was studied. The characteristics of the coatings were analyzed by Fourier transform infrared spectroscopy (ATR-IR), contact angle, differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA) and atomic force microscopy (AFM). The results showed that the mechanical properties and corrosion resistance of polyester and polyether polyols with appropriate proportion are improved significantly. The mechanism tended to be that with the addition of polyester, more hydrogen bonds were formed between the molecules, which increased the compactness of the coating as a physical crosslinking point. However, the ester groups have a strong affinity to water molecules, so the hydrophilicity of the coating was increased by excessive polyester polyols, and the shielding effect on the corrosion medium was reduced. With the inclusion of 40 % (g/g) P1012 in polyols, the coating has satisfied comprehensive properties.

    更新日期:2020-01-10
  • Phenolic fatty acid-based epoxy curing agent for antimicrobial epoxy polymers
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-09
    Kun Huang; Richard Ashby; Xuetong Fan; Robert A. Moreau; Gary D. Strahan; Alberto Nuñez; Helen Ngo

    Epoxy resins are one class of important reactive pre-polymers used in the coating industry. To manufacture epoxy resins with antimicrobial properties, active quaternary ammonium groups are often introduced into the polymeric backbones following resin polymerization reactions for structure modification. However, these complicated approaches associated with these types of reactions make the commercialization of the antimicrobial epoxy polymers uneconomical, impractical and inconvenient. Besides, quaternary ammonium groups are undesirable because the hydrophilicity of the groups makes the resins less water-resistant. In order to simplify the development of antimicrobial epoxy polymers, we prepared an amide by reacting novel bio-based phenolic-branched fatty acids with ethylenediamine. The resulting amide was cured into a commercial epoxy resin -- diglycidyl ether of bisphenol A (DGEBA), which was solution-cast into epoxy polymer films. The antimicrobial activities of the resulting epoxy polymer films were investigated. The crude phenolic branched fatty acid amides (PBC-FAAs) as curing agents were separated and characterized by thin-layer chromatography, proton nuclear magnetic resonance (1H-NMR), gas chromatography-mass spectrometry (GCMS), liquid chromatography-mass spectrometry (LC/MS) and Fourier-transform infrared spectroscopy (FT-IR). The thermal and mechanical properties of the polymer films were also investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). Cured epoxy films prepared from purified PBC-FAA exhibited antimicrobial activity against Listeria innocua. However, the crude, unpurified PBC-FAA-cured epoxy film showed much more promising antimicrobial activity against both Listeria innocua (Gram positive) and Escherichia coli (Gram negative).

    更新日期:2020-01-10
  • Embedded polyhedral SiO2/castor oil-based WPU shell-core hybrid coating via self-assembly sol-gel process
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Linlong Meng; Haoxin Zhu; Bing Feng; Zhenhua Gao; Di Wang; Shuangying Wei
    更新日期:2020-01-09
  • Microwave absorption coating based on assemblies of magnetic nanoparticles for enhancing absorption bandwidth and durability
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Yibing Ma; YaYa Zhou; Chunhong Qi; Youyi Sun; Yinghe Zhang; Yaqing Liu

    A new class microwave absorption coating based on assemblies of core-shell magnetic nanoparticles was facile preparation to improve absorption bandwidth and durability. The microwave absorption coating with a thickness of ca.1.5mm exhibited a wide bandwidth (ca.9.2GHz). Furthermore, the durability of microwave absorption coating was further evaluated. It showed good water-shedding ability and mechanical stability. The excellent performance was mainly attributed to special surface rough structure and low surface energy of coating, resulting from assemblies of core-shell magnetic nanoparticles. These provide a new idea to design and preparation of microwave absorption coating with high performance for application in stealth technology.

    更新日期:2020-01-09
  • Waterborne acrylic-styrene/PDMS coatings formulated by different particle sizes of PDMS emulsions for outdoor applications
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-08
    Jaber Khanjani; Ahad Hanifpour; Shahla Pazokifard; Mohammad J. Zohuriaan-Mehr

    This research focuses on the characteristics of water-based pigmented coatings prepared by PDMS latexes in different sizes blended with acrylic-styrene (ASC) latexes. PDMS latexes were synthesized through macro-emulsion and micro-emulsion polymerization of octamethylcyclotetrasiloxane in two different average particle sizes (i.e., 88 nm and 19 nm named mac.PDMS and mic.PDMS, respectively) and then individually blended by ASC latex in an optimum weight ratio. Compatibility and viscoelastic properties of the blends were evaluated through dynamic mechanical thermal analysis (DMTA). A single DMTA peak confirmed the compatibility between the ASC and PDMS polymers. The performance of the blends in pigmented coatings was first evaluated through measuring loading disperseability index (LDI) of the latex blends, then via measuring wet scrub resistance, dirt pick-up resistance, weathering resistance and washability in the pigmented coatings prepared from the latex blends. The LDI values of 9.5 and 10.8 were obtained for mac.PDMSand mic.PDMS/ASC blends, respectively. Test results on pigmented coatings showed both mac.PDMS and mic.PDMS led to improve outdoor performance of water-based acrylic coatings. However, mic.PDMS latex improves further weather and dirt pick-up resistances (using CIE color measurements) and washability in the coatings. Consequently, smaller particle sizes of PDMS latexes lead to enhance the performance of outdoor acrylic coatings as the waterborne and environmentally friendly materials.

    更新日期:2020-01-09
  • Relation between the corrosion resistance and the chemical structure of hybrid sol-gel coatings with interlinked inorganic-organic network
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-07
    F.X. Perrin; F. Ziarelli; A. Dupuis

    Organic-inorganic hybrid coatings have been prepared by a sol-gel route from 3-glycidoxypropyltrimethoxysilane (GPTMS) and tetraethoxysilane (TEOS) with triethylenetetramine (TETA) added in the sol formulation. The main goal of this research was to evaluate how the chemical structure of the GPTMS/TEOS/TETA hybrid coatings influences the corrosion of mild steel. The presence of TETA as an epoxy opening agent offers the possibility to form interconnected epoxy-amine and silica networks. It was found by means of 29Si HRMAS NMR spectroscopy that TETA acted as an efficient basic catalyst for the condensation of GPTMS and TEOS. This accelerates the gelation and gives limited shelf life to GPTMS/TEOS/TETA sols. Structural characterization of the cured hybrid coatings was performed using 13C and 29Si Solid State NMR spectroscopies. The results show that the epoxy amine reaction is the principal epoxide ring opening reaction. The slow formation of diol units with sols prepared with an excess of epoxy groups has also been observed. It was found that the polymerization of the organic network hindered the polymerization of the siloxane network. As a result, the film based on an epoxy rich off-stoichiometric formulation had a higher Persoz hardness value compared to the stoichiometric film. The corrosion behavior of the coatings in neutral chloride solution was studied through electrochemical impedance spectroscopy (EIS). The results revealed that barrier properties have been improved by the addition of TETA to sol-gel films. The films based on epoxy rich off-stoichiometric formulation and those base on stoichiometric formulation resulted in similar barrier properties but a higher resistance to interfacial delamination was observed for the epoxy rich off-stoichiometric films. The relationship between the film structure and its corrosion behavior was discussed.

    更新日期:2020-01-08
  • An eco-friendly and effective flame retardant coating for cotton fabric based on phytic acid doped silica sol approach
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-07
    Xian-Wei Cheng; Ren-Cheng Tang; Jin-Ping Guan; Shao-Qiang Zhou
    更新日期:2020-01-08
  • Improving nanoparticle dispersion and polymer crystallinity in polyvinylidene fluoride/POSS coatings using tetrahydrofuran as co-solvent
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-06
    Mehrdad Khodaie; Ardeshir Saeidi; Hossein Ali Khonakdar; Javad Seyfi; Iman Hejazi; Seyed Mohammad Davachi; Hooman Bahmanpour
    更新日期:2020-01-07
  • Effects of graphene on the corrosion evolution of zinc particles in waterborne epoxy zinc-containing coatings
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-06
    Shiyu Huang; Gang Kong; Bo Yang; Shuanghong Zhang; Chunshan Che

    In this paper, graphene/ waterborne epoxy zinc-containing coatings with different graphene contents were prepared. The corrosion resistance properties of the graphene/ waterborne epoxy zinc-containing coatings were investigated by electrochemical impedance spectroscopy (EIS), immersion test and neutral salt spray test. The results showed that addition of 0.6 wt% graphene into the coating could remarkably improve its cathodic protection performance and barrier performance comparing with the coating without graphene. In addition, the effects of graphene on the corrosion evolution of zinc particles in the coating were observed by the field-emission scanning electron microscopy (FE-SEM) coupled with energy dispersive spectroscopy (EDS). The results showed that the zinc particles near the interface between steel substrate and the coating corroded firstly after the corrosive media diffused in the coating and reached the interface due to the cathodic protection to the steel, and then zinc particles continued to be corroded from the interface to upper part of the coating since they could provide the cathodic protection to the substrate thanks to the electrical connection of graphene. Meanwhile, X-ray diffraction (XRD) patterns confirmed the corrosion products of the zinc particles were mainly consisted of Zn5(OH)8Cl2·H2O.

    更新日期:2020-01-06
  • Preparation and evaluation of fouling-release properties of amphiphilic perfluoropolyether-zwitterion cross-linked polymer films
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-05
    Antonio J. Ruiz-Sanchez; Andrew J. Guerin; Osama El-Zubir; Gema Dura; Claudia Ventura; Luke I. Dixon; Andrew Houlton; Benjamin R. Horrocks; Nicholas S. Jakubovics; Pier-Antonio Guarda; Giovanni Simeone; Anthony S. Clare; David A. Fulton

    The biofouling of marine structures presents a problem for maritime industries, including increasing fuel and operational costs. There has been much work developing and evaluating chemically ‘ambiguous’ amphiphilic coatings based upon hydrophobic fluoropolymer and hydrophilic poly(ethylene glycol) (PEG). Many of these coatings have shown good fouling-release performance against diatoms, which present a fouling challenge to commercially-available state-of-the-art silicone-based fouling-release coatings. However, PEG is prone to oxidation, which limits its practical use in the marine environment, and thus an alternative hydrophilic material would be desirable in the future development of amphiphilic coatings. In this regard, zwitterionic materials are emerging as a promising class of hydrophilic antifouling material, which we hypothesized would be a suitable alternative to PEG within amphiphilic coatings. To test this hypothesis, cross-linked amphiphilic films consisting of commercially available perfluoropolyethers and the zwitterionic monomer sulfobetaine methacrylate were developed and studied. The difficulty in formulating these chemically incompatible species was overcome by careful choice of solvents and a series of prototype cross-linked films were prepared in which increasing quantities of zwitterion were systematically incorporated. The fouling-release performance of these films was tested against the diatom Navicula incerta, a common microfouling organism responsible for the formation of so-called ‘slime’ layers, and antifouling performance with cypris larvae of two barnacle species, Balanus amphitrite, and Balanus improvisus. To expand the scope of the study, the clinically-relevant biofilm-forming pathogen Staphylococcus aureus, which is a major culprit in the infection and failure of millions of indwelling medical devices, was also evaluated. Results indicate that the incorporation of zwitterion into perfluoropolyethers leads to significant improvements in fouling-release performance and these amphiphilic coatings display potential in fouling-release applications.

    更新日期:2020-01-06
  • Evaluation of thermally hydrolyzed specified risk materials cross-linked with glutaraldehyde for tackifier applications
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-05
    Tao Shui; Birendra B. Adhikari; Michael Chae; David C. Bressler

    Specified risk materials (SRMs) are the tissues in cattle where misfolded proteins that cause "mad cow disease" are likely to concentrate, and thus they must be segregated from normal consumption. In this study, peptides derived from SRM hydrolysates were characterized and applied in the development of tackifiers. As one of the key components of a hydro-mulch mixture, tackifiers are employed to bind wood fibres and seeds of plants to the soil in order to facilitate improved rooting. However, sufficient hydrophobicity is also required by tackifiers to prevent diffusion and loss of function when exposed to high levels of moisture. Thus, glutaraldehyde cross-linking was examined to moderate hydrophobicity of SRM-derived peptides. Moreover, other characteristics of the peptides and cross-linked products were assessed and compared with commercial tackifiers. This demonstrated the competitiveness and potential of our SRM bioconversion strategy to produce tackifiers.

    更新日期:2020-01-06
  • Nonisothermal cure kinetics of epoxy/MnxFe3-xO4 nanocomposites
    Prog. Org. Coat. (IF 3.42) Pub Date : 2020-01-02
    Maryam Jouyandeh; Seyed Mohammad Reza Paran; Seyed Soroush Mousavi Khadem; Mohammad Reza Ganjali; Vahideh Akbari; Henri Vahabi; Mohammad Reza Saeb

    Nonisothermal cure kinetic of epoxy containing bare and Mn doped Fe3O4 nanoparticles was studied through differential scanning calorimetry (DSC). The evolution of the apparent activation energy (Eα) as a function of the extent of curing reaction was evaluated by using model-free integral Kissinger and differential Friedman isoconversional methods. Mn2+ cations in the MnxFe3-xO4 were the reason for facilitated epoxy curing reaction, as proved by a lower values of Eα obtained for the corresponding nanocomposite. Moreover, MnxFe3-xO4 nanoparticles increased the average autocatalytic reaction order from 0.48 for neat epoxy to 0.52 for epoxy/Mn-Fe3O4 nanocomposite due to the participation of hydroxyl groups on the surface of nanoparticle in epoxide ring opening. Addition of Fe3O4 and Mn-Fe3O4 nanoparticles decreased collisions between the curing moieties, as reflected in a drop in the frequency factor from ca. 18.9 for neat epoxy to 13.4 and 14.9 for epoxy nanocomposites containing 0.1 wt.% of Fe3O4 and Mn-Fe3O4, respectively.

    更新日期:2020-01-04
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