Abstract In this study, to mimic the hydrophilic character of cotton, the industrially prominent polyacrylonitrile (PAN) fibers were enriched by polar OH-groups via the graft copolymerization technique. For this purpose, the grafting of the 2-hydroxyethyl methacrylate (HEMA) was ensured in the high graft yields (∼95%). The effects of polymerization conditions such as the solvent selection, initiator

Abstract Helical polycarbodiimides with either naphthalene or anthracene side chains display chiroptical switching properties in solution and the solid state. This interesting chiroptical switching occurs due to the expansion and contraction of the helical backbone and the simultaneous reorientation of the aromatic side chains. Herein, we modified the aliphatic side-chain structure to induce the switching

Abstract To solve the key problem of accelerated aging for packer rubber cylinder under high temperature. The hydrogenated nitrile rubber (HNBR) composites reinforced by multi-walled carbon nanotubes (MWCNTs) were prepared. Effect of MWCNTs on the aging performance of HNBR/MWCNTs composites was studied with dilute oxygen as a medium at 180 °C. Fourier-infrared spectroscopy, differential scanning calorimetry

Abstract This research was focused on the synthesis of core-shell bottlebrush polymer poly(PCL-b-PEG) (PCL: polycaprolactone; PEG: polyethylene glycol) through a combination of ring-opening polymerization (ROP) and ring-opening metathesis polymerization (ROMP). Three main steps were involved in this synthesis: firstly, the ROP of ε-caprolactone was conducted to form an amphiphilic linear polymer PEG-b-PCL

Abstract In this study, a high-performance CO2 separation membrane was fabricated by compounding amine-based additives with composite polymers composed of polyvinyl alcohol (PVA) and water-absorbing agents. First, the separation performances of several different membranes were compared; through this process, it was found that the performance was improved when sodium polyacrylate (PAANa) was added to

Abstract An efficient method for the preparation of polymer grafted gibbsite nanoplatelets (NPs) was proposed by direct preparation of initiator-tethered gibbsite (gibbsite-Br) NPs followed by surface-initiated atom transfer radical polymerization (SI-ATRP) to obtain gibbsite particle brushes. By adding portion of water-soluble solvent (e.g., alcohol), individual ATRP initiator-tethered gibbsite NPs

Abstract The synthesis and characterization of a novel polyester, based on citric acid and two plasticizers (glycerol -GLY- and ethylene glycol -EG-) using concentration CA:Plasticizer ratios (1:1, 1:2 and 1:3), is described. Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear magnetic resonance (C-NMR) confirmed the functional groups characteristic of polyester, such as O-H, C-H, C-O, and C = O

Abstract The purpose of the present study was to compare the tensile and impact performances of foams of PP/γ-irradiated elastomer blends with that of the foams of PP/unirradiated elastomer blends. Furthermore, the morphological and crystallinity studies were considered to correlate the tensile and impact behavior of foams. Foaming of blends was carried out in a batch foaming set up with supercritical

Abstract Herein, benefiting from effective energy-dissipation mechanism, the high-performance thermoplastic elastomers (ZASM/SEBS composites) with excellent mechanical strength-toughness combination were prepared by blending 3-Amino-1,2,4-triazole (ATA), maleic anhydride grafted styrene-ethylene/butadiene-styrene triblock copolymer (SEBS-g-MA), zinc acetate and styrene-ethylene/butadiene-styrene triblock

(2021). High thermal stability and low dielectric constant of soluble polyimides containing asymmetric bulky pendant groups. Journal of Macromolecular Science, Part A. Ahead of Print.

Abstract Dual-responsive nanocapsules of poly (N-isopropyl acrylamide (NIPAM)-co-acrylic acid (AA)-co-2-hydroxyethylmethacrylate (HEMA)) were synthesized by precipitation polymerization. The dual (temperature- and pH-)-responsive nanocapsules were fabricated using NIPAM as a temperature-sensitive monomer, AA as a pH-responsive monomer and 5-fluorouracil (5-FU) as a model drug. The P(NIPAM-co-AA-co-HEMA)

Abstract Porphyrins and fullerenes were suitable for the construction of multi-component reticular polymer owing to the interaction of their coordination. In this work, a novel organic porous polymer (PPZ/C60) composed of metalloporphyrin and fullerene was designed and constructed. Compared with the traditional sawtooth structure, a fullerene encapsulated in porous zinc porphyrin polymers (PPZ/C60)

Abstract Monitoring of trace amount of toxic metal ions in aqueous and biological systems is vital because exposure to even low concentrations of toxic metal ions can have severe consequences on human health and the environment. Various synthetic methodologies are utilized to fabricate chemosensors that can specifically detect these toxic metal ions with high sensitivity. Recently, fluorescent sensors

Abstract In this article, the current state and future perspectives in the application of complexes of Lewis acids with ethers in the synthesis of highly reactive polyisobutylene (HR PIB) were critically reviewed. The complexes of metal halides with ethers showed good activity and regioselectivity in the synthesis of HR PIB only in polar solvents due to their poor solubility in hydrocarbons. In strong

Abstract Three MgCl2 supported TiCl4 pro-catalysts; Cat-A, Cat-B and Cat-C were synthesized. Cat-A was synthesized without any internal Lewis base (ILB); while Cat-B and Cat-C were synthesized using diisobutyl phthalate and ethyl benzoate as ILBs respectively. The effect of ILBs on stereoregularity and the microstructure of polybutadiene (PBD) was investigated. The vast differences in the amount of

Abstract A new class of polyimides had been synthesized from a novel aromatic diamine, 2',7'-bis(4-aminophenoxy)-spiro(4,5-diazafluoren-9,9'-xanthene). Polyimides were prepared by two-stage polycondensation of diamine monomer with various aromatic dianhydride. These polymers showed good thermal stability, solubility and optical transparency. These polymers showed good thermal stability, solubility

Abstract The purpose of this study is to develop microspheres (core/shell) based on natural polymers used for bone tissue engineering. The morphology, structure, particle size, drug loading and encapsulation efficiency of the microspheres were characterized by field emission scanning electron microscope (FESEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet spectrophotometer (UV) and

Abstract Stimuli-responsive polymers as drug delivery vehicles have generated remarkable interest among polymer researchers during the last decade. In the present work, we report the synthesis of a new water soluble pH- and thermo-responsive biocompatible block copolymer containing phenylalanine derivatives. The block copolymer formed micelle-like self-assembled nanoparticles above critical aggregation

Abstract In this work, solutions of low molecular weight chitosan with the concentration of 4 and 5 wt.% were subjected to electrohydrodynamic forming at the feed rate of 0.1 and 0.2 ml/h. Using a statistical analysis of the electron scanning microscopy data, it was shown that at the concentration of 4 wt.%, spherical particles of two types are formed: most of the particles are with the average diameter

Abstract Nanocomposite polyelectrolyte membranes (PEMs), based on chitosan, and imidazole surface modified multi-walled carbon nanotubes (MWCNT-Im), were fabricated as new alternative membranes to Nafion for direct methanol fuel cell (DMFC) applications. The characterization results revealed that the imidazole groups, as proton conducting sites, can provide the better dispersion of the nanofillers

Abstract Poly(oxanorbornene)s with zinc(II) phthalocyanine side chains have been synthesized by ring-opening metathesis polymerization. The incorporation of zinc(II) phthalocyanine into cationic polymer has given poly(oxanorbornene)s noteworthy photophysicochemical properties and the capacity to generate singlet oxygen under light irradiation. To investigate photosensitizer’s properties of the newly

Abstract Biopolymer-based hydrogels are important cell scaffolding materials for drug delivery and regenerative medicine. In this study, we report a covalently cross-linked composite chitosan-alginate hydrogel possessing pH sensitivity to degradation for drug delivery. To enhance mechanical strength of hydrogel, polyvinyl alcohol (PVA) was also added to form hydrogen bonds with polysaccharides under

Abstract Donor-Acceptor Stenhouse Adducts: a novel type of photoswitchable compounds that consist of donors, acceptors, and trienol-enol bridges, have gained great attention for their unique light responsive properties. In this review, we summarized the development and applications of DASAs. It covers three parts: (1) typical synthesis routes toward different DASAs; (2) mechanism for photo-switchable

Abstract The review précises progress in the design, characteristics and potential of polyimide/graphene nanocomposite foam. The polyimide and graphene based foam architectures have been designed using two strategies, i.e., reinforcement of polyimide foam with graphene/graphene oxide nanofiller and the inclusion of preformed graphene, graphene oxide, reduced graphene oxide, or modified graphene foams

Abstract Four bare silica particle carriers with different particle sizes and functional organic-inorganic silica particles (SiO2-2/P4VP-psl) “grafted” by P4VP-psl (polypyridinium salt) were selected to test their antibacterial and antifouling activities. The relationships between particle sizes, grafting degrees of pyridinium salt unit and their antibacterial ability were investigated by using Escherichia

Abstract Preparation, characterization and applications of a novel polyurethane based superhydrophobic and superoleophilic absorbent were studied for the purpose of oil-spill cleanup or water-oil/organic solvent separation. Porous superhydrophobic polyurethane foam was synthesized, followed by a one-step reaction to incorporate copper oxide nanoparticles (nano CuO) and n-hexadecylamine (HDA) onto the

Abstract In this contribution, novel bio-derived rosin acid ester compounds have been developed and used as internal electron donors to prepare MgCl2 supported titanium catalysts for propylene polymerization. The results of the polymerization showed that tri-n-amyl maleate, triiso-amyl maleate and tri-n-heptyl maleate as internal electron donors in Ziegler-Natta catalysts all have high polymerization

Abstract The development of wound dressing materials for effortless and easy treatment is crucial to accelerate the wound healing process. It is particularly preferred that the material used for this purpose is biocompatible. In this study, controlled release of the most commonly used antibiotic, mupirocin, against Staphylococcus aureus (ATCC 25923), gram-positive bacteria species and one of the leading

Abstract The new aromatic m-catenated diamine, N-(3,5-diaminophenyl)-4-(naphthalen-7-yloxy)benzamide was synthesized from 2-naphthol and 4-fluoro benzonitrile as starting materials. A series of novel aromatic polyamides were synthesized from the diamine and several aromatic diacids such as 4,4′-Oxydibenzoic acid, Naphthalene-2, 6-dicarboxylic acid, 4,4′-Sulfonyldibenzoic acid, Biphenyl-4,4′-dicarboxylic

Abstract Self-electrical stimuli substrate with the structure of gel-fiber-particles to make an electrical perimeter in contact with skin wound would provide a new outline for wound dressing applications. To fabricate such self-electrical stimuli wound dressing substitute, chopped poly(vinylidene fluoride) (PVDF)-chitosan-gelatin nanofibers and MCM41 nanoparticles were designated. Designed nanostructures

Abstract The biodegradable thermoresponsive shape memory blends with polycaprolactone (PCL) as reversible phase and polylactide (PLA) as fixed phase were prepared by the melt blending of PCL and PLA. The scanning electron microscopy (SEM) shows that the PCL/PLA blends are partially miscible blends. According to XRD analysis, a diffraction peak appears at 16.7° (200/110), it may be the crystal diffraction

Abstract Microencapsulated ammonium polyphosphate (GMAAPP) and microencapsulated expanded graphite (PUEG) were prepared by in situ polymerization with glycidyl methacrylate (GMA) and polyurethane as the shell material respectively. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and thermogravimetry (TG) were used to characterize

Abstract Dynamic bond chemistry provides a new opportunity for the reprocess and reuse of low-dielectric resins. In this study, based on our previous study, a series of reprocessable low-dielectric styrene resins were prepared by incorporating coordinated crosslinked structures with Cu, Zn, and Ni centers. The low-dielectric properties, mechanical strength, and reprocessing performance of styrene resins

Abstract In this paper, the graft copolymer PVC-g-PMMA composed of PVC main chain and PMMA side chain is synthesized by atom transfer radical polymerization. And it is added to the polyvinyl chloride/nitrile rubber (PVC/NBR) to prepare the PVC/NBR/PVC-g-PMMA composite film. The effects of PVC-g-PMMA on the mechanical properties, heat-resistant oxygen aging properties and thermal stability of PVC/NBR

Abstract Starch was extracted from potato (Solanum tuberosum) cultivated in Nepal. The yield of starch of different sorts of the species S. tuberosum was compared with each other. Extracted starch (E St.) Kufre Sindure was characterized and compared with commercial starch (Com St.) by the Fourier transform infrared spectroscopy (FTIR). The properties of extracted starch were evaluated by measuring

Abstract A porous covalent triazine-based organic framework (CTF) containing amide hydrogen-bonding was synthesized using Pigment Orange 71 under Lewis acidic (ZnCl2) conditions at 400 °C. The novel CTF material shows excellent chemical and thermal stability with 10% weight loss temperature up to 465 °C and owns a high surface area (960 m2 g−1) and a total pore volume of 0.48 cm3 g−1. The pore size

Abstract The thermoplastic elastomers (TPEs) have traditionally been used as engineered elastomers (alone or as parts of a complex system) for various therapeutic or diagnostic procedures due to their processibility, enhanced mechanical and physicochemical properties, along with the ability to undergo large deformation. This comprehensive spotlight aims to reveal why TPEs have emerged to be a huge

Abstract Recently, researchers are exploring the potential of polymer chemistry a lot in therapeutics. In conventional non-targeted polymeric drug delivery, an array of unwanted side effects was identified due to the release and distribution of therapeutic molecules into healthy cells. Consistent efforts are made to diminish such effects by encapsulating drug molecules into a well-developed stimuli-responsive

Abstract A novel amphiphilic polymer, carboxymethylated hydroxypropyl chitosan (HPCMS) was successfully synthesized for delivery of doxorubicin (DOX). The chemical structure and thermal stability were characterized by FTIR, 1H NMR and TGA, respectively. In aqueous medium, HPCMS could self-assembled into micelles with a low critical aggregation concentration of 0.54 mg/mL. The DOX-loaded HPCMS micelles

Abstract Carbon membranes have great potential for gas separation and water treatment due to their excellent chemical stability and relatively low price. However, current methods used in membrane preparation are very complicated, which largely limits their large-scale applications. Due to this, a fast and feasible non-solvent induced phase separation method, combining with stabilization and carbonization

Abstract Post-polymerization modification (PPM) techniques are extremely beneficial in terms of designing well-defined functional polymers for various applications. In particular, metal-free PMM based on fluorinated polymers has gained persistent attention of researchers. In this review, we summarized the development of reactive fluorinated polymers. It covers (i) activated esters/amine based on pentafluorophenol

Abstract Incorporating carboxyl group into the poly(vinyl chloride) (PVC) resin can endow PVC with reactivity in some applications. In this work, poly(vinyl chloride)-co-poly(acrylic acid) random copolymer (PVCA) with low average number molecular weight (Mn, ∼10 k) is synthesized by precipitation polymerization. By tuning acrylic acid dropping rate, the PVCA copolymer with much more uniform copolymer

(2021). Correction. Journal of Macromolecular Science, Part A: Vol. 58, No. 7, pp. 520-520.

Abstract As the laws about emission of volatile organic compounds (VOCs) become more and more stringent, low VOC content coatings, such as high solid polyurethane coating, gradually attract great attention. Herein, a series of star-shaped hydroxyl polyesters (SHPs) were synthesized by methyl hexahydrophthalic anhydride (MHHPA), diisopropanolamine (DIPA), and monoglycidyl ether. The number of their

Abstract Ethylene-1-hexene copolymerization was catalyzed by TiCl4/diester/MgCl2 type Z-N catalyst activated by triethylaluminium (TEA), triisobutylaluminium (TIBA) or TEA/TIBA mixtures. Copolymerization activity decreased with increase of TIBA content in the cocatalyst. Each copolymer sample was fractionated into boiling n-heptane soluble and insoluble fractions. 1-Hexene content of the soluble fraction

Abstract In the article, PVDF-based composites reinforced by MWCNT and phenolic epoxy resin were prepared by solution casting method to get a material with excellent mechanical properties and high dielectric properties and breakdown strength when conductor is as filler. The experimental results demonstrate that dielectric constant of m-MWCNT/EP/PVDF composites (εr = 32 at 100 Hz) is twice times higher

(2021). Correction. Journal of Macromolecular Science, Part A: Vol. 58, No. 7, pp. 519-519.

Abstract In this study, a new type of star multifunctional polyisoprene liquid rubber 4-arm star hydroxyl terminated polyisoprene (4HTPI-Si) that can be used for rocket solid propellant matrix was designed and synthesized by anionic polymerization method. It was characterized by Fourier Transform Infrared Spectroscopy (FT-IR), 1H Nuclear Magnetic Resonance Spectroscopy (1H-NMR) and Gel Permeation Chromatography

Abstract In this work, an amino-terminated polyether (ATP) was synthesized and used for the functionalization of GO to obtain an amino-terminal polyether-functionalized graphene oxide (FGO). The structure of FGO was characterized by FTIR, Raman, XPS, XRD, AFM, SEM and TGA. And then the FGO was incorporated into waterborne epoxy resin (WEP) to prepare FGO/WEP composites. The SEM results revealed that

Abstract Although Ziegler-Natta catalysts were discovered more than four decades ago, many aspects of their characteristics are not fully understood. The effect of the support particle size on the final properties and performance of these catalysts is one of them. In this article, we present the effect of milling and heat-treating the Mg(OEt)2 support on the properties of the final catalysts and subsequently

Abstract Polyhedral oligomeric silsesquioxanes (POSS) and γ-glycidoxy propyl trimethoxy silane (KH560) were applied to modify boron nitride (BN) and boron nitride whisker (BNw), and modified BN (m-BN) and modified BNw (m-BNw) were added as thermally conductive fillers to polybenzoxazine (PBz) matrix to synthesize m-BN/m-BNw/PBz composite by hot press. The research results indicate that the modification

Abstract The aim of this comparative study was focused on the surface chemistry, in vitro biodegradation and biocompatibility of poly(L-lactic acid) (PLLA) scaffolds incorporated with poly(amidoamine) (PAMAM) and poly(propylene imine) (PPI) dendrimers. The functionality of these two types of dendrimers from second, third and fifth generations (G2, G3 and G5) onto the surface of PLLA film and electrospun

Abstract Silver nanoparticles-decorated poly(m-aminophenol) nanofibers (PmAPNFs) was prepared through the initial synthesis of PmAPNFs via chemical polymerization of m-aminophenol with ammonium persulfate (APS) and NaOCl as oxidizing agents, followed by thermo-chemical reduction of Ag+ ions into Ag nanoparticles on the PmAPNFs. Different spectroscopic and morphological analyses confirmed the formation

(2021). Correction. Journal of Macromolecular Science, Part A: Vol. 58, No. 6, pp. 431-432.

Abstract “Activator regenerated by electron transfer” “atom transfer radical polymerization” (ARGET ATRP) process catalyzed by CuCl2/tris(2-pyridylmethyl)amine (TPMA) (1/1) in ethyl acetate/ethanol (EtOAc/EtOH) for the polymerization of styrene from ethyl 2,2-dichloropropanoate (EDCP) is described. The (re)generation of the activating CuI complex is accomplished by Na2CO3 without the addition of any

Abstract “Activator regenerated by electron transfer” “atom transfer radical polymerization” (ARGET ATRP) process catalyzed by CuCl2/tris(2-pyridylmethyl)amine (TPMA) (1/1) in ethyl acetate/ethanol (EtOAc/EtOH) for the polymerization of styrene from ethyl 2,2-dichloropropanoate (EDCP) is described. The (re)generation of the activating CuI complex is accomplished by Na2CO3 without the addition of any

Abstract Polyvinylpyrrolidone (PVP) is a biopolymer compound that has been widely used in pharmaceutical and medical applications, especially as a tablet binder and solubilizing agents for injections. In this work, PVP was characterized by FTIR to confirm its structure and Dynamic light scattering (DLS) to determine its mean diameter for studying concentration ranges. PVP was radio-labeled with Technetium-99m

Abstract Polyvinylpyrrolidone (PVP) is a biopolymer compound that has been widely used in pharmaceutical and medical applications, especially as a tablet binder and solubilizing agents for injections. In this work, PVP was characterized by FTIR to confirm its structure and Dynamic light scattering (DLS) to determine its mean diameter for studying concentration ranges. PVP was radio-labeled with Technetium-99m

Abstract In this study, the ethylene/methyl acrylate/glycidyl methacrylate (EGA) terpolymer was performed to improve the stereocomplexation and toughness of poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA). The effects of EGA presence on the competing formations and crystallization kinetics of homocrystallites (HCs) and stereocomplexes (SCs), phase morphology and mechanical properties of PLLA/PDLA

Abstract The loss and overuse of avermectin (AVM) on protecting plants pose a threat to ecosystems. To increase the efficacy of AVM, fluorinated sodium carboxymethyl cellulose (CMC-g-PHFBA) was synthesized by inducing poly 2, 2, 3, 4, 4, 4-hexafluorobutyl methacrylate (HFBA), and AVM was then enveloped in CMC-g-PHFBA (AVM@CMC-g-PHFBA) via hydrophobic interaction. According to the results, the samples