In this work, the isocyanate terminated castor oil based urethane oligomer (CO-IPDI) was prepared by the reaction of castor oil and isophorone diisocyanate (IPDI) without adding any organic solvent. After the acrylic copolymer pressure sensitive adhesive (PSA) was heated at 80 °C for 20 min, it was mixed with CO-IPDI, trifunctional acrylic monomer and photo-initiator in a certain proportion to give

Various combinations of matrix, filler and classical additives lead to wide possibilities of improving material specifications for mechanical, thermal and structural properties. The studied samples were prepared from a primary polyethylene (PE) layer coated with a thin film of polycaprolactone (PCL) and modified with magnetite, casein/magnetite and zeolite/magnetite compounds. Enhancements to mechanical

This paper designed and synthesized a series of waterborne UV-curable polydimethylsiloxane‐based polyurethane oligomers which contain polydimethylsiloxane segment in the end of the main chain, a plurality of double bonds in the side chain and two kinds of hydrophilic groups including nonionic polyethylene glycol with low molecular weight and ionic quaternary ammonium salt groups. The unique structure

A novel corrosion inhibitor, ((E)-1,5-dimethyl-4-((1-(3-nitrophenyl)ethylidene)amino)-2-phenyl-1,2-dihydro-3H-pyrazol-3-one) (DNPP) was synthesized in high yield by the condensation reaction of 4-aminoantipyrine with 2-nitroacetphenone derived from acetophenone as a starting material and characterized by FT-IR, 1H, and 13C NMR techniques. DNPP was tested against the corrosion of SAE 1012 carbon steel

The poor corrosion resistance of mild steel makes serious issues (on both economical and safety aspects) in many industries and, the use of corrosion inhibitors is the opt solution to combat mild steel corrosion. The present study investigated the corrosion inhibition behavior of Tephrosia purpurea (T. purpurea) leaves extract on mild steel corrosion in 1 N HCl solution using gravimetric, electrochemical

The main purpose of this study is to evaluate the influence of different types of ceramics and surface treatment methods on the shear bonding strength(SBS). Three different CAD/CAM ceramics were divided into 4 groups, respectively according to the following surface treatments: no treatment; etching with 4.5% HF acid; Nd:YAG laser irradiation; Nd:YAG laser followed by HF acid etching and then a silane-coupling

The present study evaluates an anticorrosive system of epoxy primers applied on carbon steel coupons under different surface preparation techniques: dry abrasive blasting up to Sa 2½, wet abrasive blasting up to Sa 2½ and mechanical treatment up to SSPC SP-11. The epoxy primers were pigmented with zinc phosphate, commonly used in offshore structures, on which intermediary and anti-scaling paints are

Corrosion inhibitors based on environmentally friendly and harmless products are currently being studied and developed. The corrosion inhibition properties of caffeine (1,3,7-trimethylxanthine) on copper corrosion in aqueous chloride solution (3.5 wt.% NaCl) are analysed here using stationary and transient electrochemical methods, and a theoretical study based on density functional theory is carried

The adhesive contact between a rigid sphere and a thin elastic layer bonded on a rigid foundation is investigated using boundary element method (BEM). Surface profile is approximated parabolic. The Lennard-Jones potential and the Derjaguin approximation are used for the surface traction. In the past, the adhesive contact between a sphere and a thin layer was analyzed only in the frame of the JKR theory

Due to the high strength and adhesiveness of epoxies, these materials are widely used in various industries such as aerospace. But because of their inherent brittleness and poor fracture toughness, they do not have enough resistance against crack propagation. In adhesive joints, maximum stresses near the ends of the overlaps resulted in premature failure of the joints. In this study, for toughening

The migration and leakage of formation fluid along the cement plug/formation interface negatively affects the integrity of open-hole temporary abandoned wells. A 3-D numerical model is developed based on the cohesive zone method for analyzing the initiation and propagation of fractures along the cement plug/formation interface. The model is validated by comparison with an existing microannulus model

Four types of natural oils varied in the viscosity were added to a nitrile butadiene rubber (NBR) loaded with three bonding systems (HRH) consisting of hexamethylenetetramine (HMT), resorcinol and hydrated silica. Rubber dough was spread on the untreated polyester fabric sheet. The peel strength was used to measure the adhesion strength between the fabric and the rubber. The rubber-proofed fabric was

The objective of this in vitro study was to investigate the effect of material type, resin cement type, surface treatment, and aging on the microshear bond strength (µSBS) of self-adhesive resin cements (SARCs) to CAD/CAM blocks. CAD/CAM blocks (CeraSmart, CS; Lava Ultimate, LU; Shofu Block HC, HC; Vita Enamic, VE; Vitablocks Mark II, VM) were cut into 3-mm thick slices (96 specimens for each) and

The present study aimed to evaluate the effect of universal adhesive pretreatment on the dentin bond strength of a resin-modified glass ionomer cement after radiotherapy. One hundred human third molars without caries were employed. One-half of the teeth were irradiated (total IR = 70.2 Gy). Both the irradiated and non-irradiated teeth were randomly divided into five groups (n = 10) according to dentin

This study investigates the single-strap joints (adhesively bonded spot-welded) under static loading. Experimental tensile tests are carried out to validate the numerical analyses. For this purpose, the specimens of dissimilar materials were prepared by joining them with a thin layer of a two-component epoxy-based adhesive at one side and spot welding at the other side. Then, they were tested under

Gecko’s amazing ability to adhere to almost any kind of surface has stirred significantly research interests over the last decade. There have been a series of researches in the field of Gecko-inspired adhesives with numerous new studies focusing on nanostructured fibrillar, adhesive properties based on different materials, and various applications. In this review, after an initial overview of the conventional

In this study, a laser high-velocity impact welding of Ta/Cu metal foil was successfully realized under different laser energies and flight distances. The morphology, microstructure, and mechanical properties of welded specimens were investigated via systematic experiments. Results indicated that the plastic deformation of the welded specimens was further pronounced with the increase in laser energy

Epoxy resin (DGEBA/TETA) is commonly used as an adhesive material. When this material is subjected to low temperatures for an extended period of time, it undergoes changes in inter/intramolecular vibrations which has been probed in this research through a combination of terahertz spectroscopy, differential scanning calorimetry and infrared spectroscopy. Distinctive morphological changes of the virgin

The main objective of this work is to study the performance of prestressing steel (PS) bars as reinforcements in the reinforced concrete (RC) elements strengthened by the near-surface mounted method (NSM). The work includes two parts. In the first part, direct pull-out tests are performed in order to study the bond performance between PS reinforcement and concrete. The influences of groove sizes and

This paper presents two models: one for predicting the electrical resistivity of concrete and the other for the corrosion potential of reinforcing steel. The prediction models were developed based on experimental results, considering various influencing factors. The experiment approach included the concrete mix proportion, chloride content, concrete cover thickness and time of exposure as the parameters

Release of metal debris from a pair of gear teeth is a consequence of their contact. Any excessive metal debris can lead to the onset of fatigue and failure. This paper aims to derive a contact mechanics-based model to obtain the energy absorption of helical gear teeth. The proposed model includes the roughness effect of teeth contact surfaces. The mean value of the asperity summit curvature, the standard

Various inks with different properties are widely used in the printed electronic industry. In order to obtain high quality inkjet printing, it is necessary to study the droplet formation process and its influencing factors comprehensively. Only in this way, the incentive conditions and liquid physical parameters of droplet ejection can be obtained and optimized. Firstly, the calculation model of the

The purpose of this in vitro study was to evaluate the influence of different surface treatments and aging on the microtensile bond strength (μTBS) of bulk-fill composite resins. Bulk-fill composites (Filtek One; 3M ESPE) randomly received five different surface treatments: (1) no treatment, control, (2) 37% phosphoric acid etching (PA), (3) 9% hydrofluoric acid etching (HF), (4) air-borne particle

The expected longer service life of modified asphalt can be jeopardized by different environmental factors, such as moisture, oxidation, etc. which affect the desired properties by altering the adhesive property. An insight into knowledge of the adhesive property of the asphalt can help in providing more durable asphalt pavement. The study attempted to develop different models of adhesive properties

Soft solids undergo stick-slip instability which is characterized by the velocity weakening effect where interfacial shear stress decreases with sliding velocity. Soft solids show the hysteresis of energy release rate (G) during the stick and slip phase of a stick-slip cycle. In the present study, the effect of specimen thickness on G is studied by conducting the direct shear sliding experiments on

The adhesive contact problem of a half-space indented by a rigid cylindrical punch in the theory of couple-stress elasticity is investigated. Both the size effect and adhesion are considered to analyze the two-dimensional frictionless contact problem. The method of Mindlin’s stress function and the technology of Fourier transform are applied to reduce the mixed boundary value problem to the singular

Pulse-enhanced vacuum arc evaporation (PEVAE) which combines pulsed and direct current operation of the arc source is a new method in cathodic arc evaporation technology. One advantage is to emit large amount of electrons which leading to more ionization of gas and metal. In this work, microstructure, adhesion and properties of TiN coatings related to substrate ion current and deposition energy Ebi

A novel method of tape casting to fabricate ceramic-particulate-reinforced composite filler alloy tapes with low organics (no more than 6 wt.%) was developed, with which SiCP/Ag–Cu–Ti hybrid tapes were successfully prepared and used in joining of sintered silicon carbide ceramics. The stress rheometer, scanning electron microscopy and energy dispersive spectrometer were used to characterize the rheological

Cu interlayers with thicknesses of 1, 1.5, and 2 mm were used to join niobium and AISI 304 steel. Fractures occurred in the weld, the Nb base metal, and the unmelted Cu interlayer when the Cu interlayer thickness was 1, 1.5, and 2 mm, respectively. When the thickness of the Cu interlayer was 1 mm, the weld microstructure consisted of austenite with Cu-rich particles along the austenitic grain boundaries

The hydraulic fracturing process involves high pump pressure and large displacement, which increase the risk of debonding on the interface of the cement sheath and rock formation. Therefore, in this study, a three-dimensional numerical calculation model of casing-cement sheath-formation assembly was established, and the failure mechanism of the bonding surface caused by fracturing due to fluid migration

The shear strength of composite secondary bonded single-lap joints was studied in this article. To optimize the adhesive thickness and ensure stable mechanical properties, an improved mold was applied. Based on this mold, a total of 15 specimens (180 samples) were examined and they were fabricated with various overlap lengths, curing pressures, adhesive thicknesses, ply angles, and surface treatment

To obtain a good bonding strength of steel/CFRP adhesive joint, the steel surface was machined by grooving process. Short aramid fibers were mixed into the adhesive layer to achieve the further adhesion strength. In the pressing process of steel/CFRP specimen preparation, short aramid fibers with the diameter of several micrometers could be embedded in the grooved gap and the rough surface of CFRP

The effect of amino acids on improving the corrosion inhibition performance of i-carrageenan through increasing the polymer adhesion to the aluminum surface in 2 M HCl solution was evaluated by using weight loss measurements at temperatures ranging from 25°C to 45°C. The studied amino acids, including Glycine, Alanine, Isoleucine, Serine, and Cysteine, are believed to play an adsorption mediating role

n-Dodecyl mercaptan (DDM) chain transfer agent and 1,6-hexanediol diacrylate (HDDA) cross-linker were used to manipulate latex properties in a monomer-starved seeded semi-continuous emulsion polymerization of butyl acrylate (BA), fluorine monomer dodecafluoroheptyl methacrylate (DFMA) together with acrylic acid (AA) and 2-hydroxyethyl acrylate (HEA). The influences of both DDM and HDDA on the particle

Irvingia seed kernels have been identified as potential raw materials for a wide range of applications such as biodiesel, cosmetics, perfume, and soap. As a result, the Irvingia wood species is earmarked for domestication globally in order to commercially exploit these potential benefits. This study investigated the physical and mechanical properties of experimental panels made with pine (Pinus elliottii)

The paper presents the development of the mathematical model of joint parameters impact, during solid wood lengthening with a mini tooth, on the joint strength. Impact parameters are wood density (ρ), ratio of wood element width and thickness (b/h) and geometrical size of mini tooth expressed as ratio of length and distance between width of the tooth (l/p). This paper presents an example of how the

Temperature distribution has an important influence on grain morphology during laser welding process. In this investigation, a three-dimensional finite element model considering the effect of different laser welding parameters on heat distribution was established. Moreover, the macro profile and grain morphology in different regions of 6061 aluminum alloy laser welded joints were studied considering

Friction stir welding is a novel solid-state welding process for joining aluminum alloy components. The heat generation, proper mixing of joint line material and properties of welds depends on the profiles of friction stir tools. Aluminum alloy Al 1120 plates were welded via friction stir welding using deferent friction stir tools. The effects of tool pin profile on mechanical properties were reported

In this paper, different types of carbon-based fillers such as graphite powder (GP), expanded graphite powder (EGP), expanded graphite flakes (EGF), silane treated expanded graphite flakes (EGS) and exfoliated graphene nanoplatelets (GNPs) were used at 40 wt% loading level inside epoxy resin for comparative thermal conductivity enhancement analysis. Disc-shaped epoxy adhesive composite samples were

The main purpose of this study was to investigate the distribution of potential of steel in patching-repaired concrete. Reinforced concrete specimens were prepared with and without patching repair, made with various concrete mix proportions. Experimental results revealed that patching repair showed good effectiveness for restoring corroded reinforced concrete structures. The highest half-cell potential

Filling of cells with liquid electrolytes is the time-determining step in the production of lithium-ion batteries (LIBs). The influencing factors are not completely understood and need further research. The adhesion of the solid components, i.e. anode, cathode and separators, to the electrolyte and the respective interfaces play an important role. In this study, the penetration of liquid electrolytes

In this study, the performances of type of demountable connectors used as connecting elements in the frame construction furniture are compared with the forces against shear force. The test samples were prepared from melamine-coated particle board (YL-Lam) and medium density fiberboard (MDF-Lam). Four types of demountable type of connection elements are used: metal L connection, plastic T connection

This article aims to elucidate the long-term water stability of a steel slag asphalt mixture. Both chemical composition and physical morphology of the steel slag were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), the Vickers hardness test and mercury injection testing. Methods of testing wet-dry (W–D) cycles and freeze-thaw (F–T) cycles were designed, and corresponding

Dual phase (DP) steels have a great deal of importance in the automotive industry. These steels are used to fabricate structural parts of vehicles with the goal of passenger safety. In this study, the corrosion properties of DP 600 and 800 steel in 3.5 wt.% NaCl environment were evaluated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), and weight loss methods

Epoxy-based isotropic conductive adhesives (ICA) have become the dominant materials in the microelectronic packaging field due to their advantages of low technological temperature, ultrafine line printing, and easy interconnection. During the service of electronic products, the ICA joints are subjected to shear loads induced by mechanical mismatch between packaging chip and substrate. In this work

This paper investigated the axisymmetric contact problem of a functionally graded material (FGM) coating by considering the adhesion effect. The Maugis–Dugdale adhesion theory is adopted to describe the adhesion effect between the contact bodies. The Hankel integral transform is applied to obtain the singular integral equations which represent the axisymmetric adhesive contact problem of FGM coating

The corrosion inhibition and adsorption behavior of glutamic acid (Glu), glutamine (Gln), and their cerium complexes: cerium glutamate (Ce(Glu)) and cerium glutamine (Ce(Gln)) on mild steel in 0.5 M HCl solutions were studied at 25 and 55 °C and concentration range of 25–200 ppm using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopic (EIS) techniques. The inhibition efficiency

The aim of this study was to investigate the physicochemical properties of five resin cements and their effects on bonding to zirconia ceramics. The degree of conversion (DC) and water contact angle of five resin cements were measured. Fifty zirconia blocks were randomly divided into five groups according to resin cements (RelyX Ultimate [RUL]; Panavia F [PF]; Clearfil SA Luing [CSA]; Multilink Speed

Electro-polymerized pyrrole composite incorporated with TiO2 and phenylalanine (Phe) was electrodeposited over Fe–C steel sheet at time intervals of 1200 s and 1500 s using chronopotentiometry. The composite (PPy–TiO2–Phe) was evaluated against corrosion in 3.5% NaCl solution on Fe–C steel. The composite coated (CC) steel was studied and compared through scanning electron microscopy (SEM), X-ray diffraction

Fracture modes I and II interact in mixed-mode loading conditions, and the interaction is typically taken into account using a mixed-mode fracture criterion. In this work, a concept for defining the criterion is developed through an experimental-numerical simulation analysis. The mixed-mode behaviour for the criterion is tested and analysed with a single specimen design. The design of the specimen

It is said that plasma electrolytic oxidation (PEO) is considered as an effective technique to boost the surface properties of light materials by means of forming ceramic films on their surfaces. In this study, three different voltage values were applied to the PEO process to AA2024 so that Al2O3 ceramic coatings were directly supplied for AA 2024 substrates by PEO and it is focused on the adhesion

The moisture stability of an asphalt mixture was enhanced with cement, hydrated lime, and an anti-stripping agent (called AMR II) to improve the adhesive bond of asphalt with the aggregate. A total of eight asphalt binders and three aggregates (crushed gravel, limestone, and granite) were used for the preparation of different asphalt mixtures. Indirect tensile strength and residual stability tests

The three-dimensional finite element method was used to analyse the effect of changing the buccal tube baseplate shape on the stress magnitude and distribution at the interface between the buccal tube and the adhesive layer in a buccal tube-adhesive layer-tooth continuum under shear and tensile loads. A stress regression analysis was used to select the optimum mesh design and was verified by in vitro

Melamine-formaldehyde (MF) polymer is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. The limited storage stability of MF polymer solutions hampers the applicability of these resins. The effects of several operative parameters, viz., reaction vessel pH, reaction time and temperature on the synthesized polymers (resins) stability time were investigated.

In this study, the effect of saliva contamination and cleaning procedures on the bond strength of lithium disilicate (LS2) ceramics was investigated at different timings of silane treatment. Micro-tensile bond strength (μTBS) test using a universal testing machine was performed (n = 24). For analysis of adhesive surface characteristics, water contact angle was measured (n = 3). After saliva contamination

Commercially available fibrin glue is expensive and contains fibrin and thrombin from different sources. This limits the use of this glue for bonding regular wounds, increases the cost for cardiovascular surgeries and aggravates the risk of inflammatory and immune systemic allergic reactions. This study aims to develop a stronger and affordable fibrin glue synthesized from the patient’s own plasma

Polyesteramide (PEA) based hot melt adhesive (HMA) was successfully designed containing a high content of renewable mass. The PEA HMA was synthesized based on dimer acid (DA), catechol, ethylenediamine (EDA), ricinoleic acid amide (RA amide) which was synthesized by using ricinoleic acid and diethanolamine. RA amide was reacted with dimer acid with a varying concentration of RA amide by 5%, 10%, 15%

To improve their adhesion strength, polymeric surfaces are usually modified through different treatments. This study investigates the effect of mechanical, chemical, and energetic treatments on the bonding strength of ethylene propylene diene methylene (EPDM), polyvinyl chloride (PVC), and acrylonitrile butadiene styrene (ABS) materials. Three adhesives based on different chemical compositions, namely

The formation of underwater adhesion is a complicated physiological process and many different types of enzymes are found to be essential apart from structural proteins. Previous studies have shown that various tyrosinases were present in marine adhesives, but little information is available about the over-expression and enzymatic characterization of these enzymes. Specifically, this study first identified

The surface pretreatment before bonding repair determines the microscopic physical and chemical properties of the composites, and directly affects the bonding strength and maintenance effect. In this paper, the surface of the Carbon Fiber Reinforced Polymer (CFRP) was pretreated by Cold Plasma Treatment (CPT) under 2.5 times air atmosphere (0.25 MPa) to achieve the best interface micro-performance