Effect Of Silane Coupling Agent Research Articles

Engineering the interface of organic/inorganic composite solid-state electrolyte by amino effect for all-solid-state lithium batteries

Composite solid-state electrolyte (CSSE) with integrated strengths avoids the weaknesses of organic and inorganic electrolytes, and thus become a better choice for all-solid-state lithium battery (ASSLB). However, the poor dispersion of inorganic fillers and the organic/inorganic nature difference leads to their interface incompatibility, which greatly destroys the performance of CSSE and ASSLB. Herein, silane coupling agent (SCA) aminopropyl triethoxysilane (ATS) is introduced to tailor the organic/inorganic interfaces in CSSE by the common chemical bridging effect of SCA and the special amino effect (hydrogen bond and lone pair electron effects). It is found that the hydrogen bond interaction between –NH2 and polyethylene oxide (PEO) enhances their interface interaction. And the lone pair electrons on nitrogen atom allow it to react with solvent acetonitrile and promote the uniform dispersion of ceramic fillers. Moreover, the lone pair electrons can complex with Li+, which promotes the dissociation of Li salts, uniforms Li+ diffusion and inhibits the Li dendrite. Thanks to the above merits, the interface compatibility and stability of organic/inorganic CSSE are much enhanced by innovatively introducing ATS, showing high ionic conductivity and superior mechanical/thermal stability. The ASSLB with this modified CSSE exhibits excellent electrochemical performance with a reversible capacity of 140.9 mAh g−1 and a capacity retention of 94.4% after 280 cycles. These achievements offer a new insight into improving the stability of organic/inorganic CSSE interface and promoting their applicability into ASSLB.

Effect of Silane Coupling Agents on the Rheology, Dynamic and Mechanical Properties of Ethylene Propylene Diene Rubber/Calcium Carbonate Composites.

The effects of three trimethoxysilanes with different functional groups on the rheology, dynamic and mechanical properties of ethylene propylene diene rubber (EPDM)/calcium carbonate (CaCO3) composites were investigated respectively. The results showed that the addition of silane increased the value of MH and MH–ML of the compounds. Geniosil XL 33 silane decreased the shear modulus of the EPDM/CaCO3 compounds, and the bound rubber content increased slightly with the addition of vinyl trimethoxy silane (VTMS) and methylacryloxy-methyltrimethoxysilane (Geniosil XL 33) silane in the compounds. The vulcanizates with the addition of the VTMS and Geniosil XL 33 silane showed a significant increase in tensile strength and abrasion resistance; however, ethyltrimethoxysilane (ETMS) silane weakened the tensile strength and abrasion resistance of the vulcanizates. At low strain, the cross-linking and reaggregation of fillers resulted in a high storage modulus of vulcanizates with silane. When the strain exceeded 10%, the storage modulus of the vulcanizates with the Geniosil XL 33 and VTMS silane was higher. The loss modulus and tan δ of the vulcanized rubber with the Geniosil XL 33 and VTMS silanes were lower compared to the ETMS and 0 silane.

The synergistic strengthening effect of silane coupling agent on the interface between PVA/EPS and cement: experiment and molecular simulation

ABSTRACT Expanded polystyrene (EPS) concrete is a new type of green building material. To make it more widely used, in this work, polyvinyl alcohol (PVA) fiber and silane coupling agent (SCA) were used to toughen it. The synergistic enhancement mechanism of SCA on PVA/cement and EPS/cement interfaces was systematically investigated from macro mechanical properties, microstructure characteristics, and nano interface interaction. Firstly, based on the mechanical property test, it was found that the introduction of SCA and PVA fibers can significantly improve the flexural strength of EPS composite concrete at 7 and 28 days, followed by the compressive strength. Secondly, the cut pieces of corresponding composite concrete were observed by electron microscope. It was found that SCA made the two interfaces more closely, and its bonding effect at the micro interface was described. Finally, molecular dynamics (MD) was used to model PVA/C-S-H and EPS/C-S-H with or without SCA. Then, the local structure, dynamic performance, and binding energy of the interface were calculated and analyzed. The analysis results showed that SCA reduced the interface effect and enhanced the interface hydrogen bonding, van der Waals interaction, Ca-H coordination bond and stability. Thus, the interfacial adhesion energy was improved, and the weak interfacial bonding between organic polymers (PVA, EPS) and inorganic silicates (C-S-H) was enhanced.

Ring-opening metathesis polymerization (ROMP) polymers as structural adhesives and the effects of silane coupling agents on their lap shear properties

In this study, single lap shear experiments with Al2024-T3 substrates were used to evaluate poly(dicyclopentadiene) (pDCPD) for structural adhesive applications. A wide range of monomer-to-catalyst ratios (M:C = 10,000:1 to 90,000:1) and four different silane coupling agents (i.e. hexyl, hexenyl, allyl, and norbornyl trimethoxysilane) were used to understand their effects on the adhesive shear properties of pDCPD. The roles of pDCPD oxidation and the bulk polymer on adhesive properties were also investigated using paint and dynamic mechanical analysis (DMA) measurements. Collectively, the data show that the choice of silane has a significant influence on the lap shear strengths of pDCPD, while the M:C ratio has a smaller but significant influence. Differences in bulk polymer topology as measured by DMA and oxidation of the resin had insignificant effects in the absence of exposed oxygen-rich surfaces that influence catalyst activity. With shear strengths up to 21.6 ± 0.7 MPa for dry conditions and up to 13.0 ± 0.7 MPa for hot-wet conditions (i.e. submersion in deionized water at 60 °C for 2 weeks), we showed that pDCPD-based adhesives have comparable lap shear properties to a well-studied model thermoset epoxy (i.e. DGBA/D230).

Additive manufacturing of complex-shaped and high-performance aluminum nitride-based components for thermal management

Improved heat dissipation performance, by way of thermal management, is critical in many engineering applications. In this study, three types of silane coupling agents were used to modify aluminum nitride (AlN) powder for vat photopolymerization. The effect of silane coupling agents on the rheology, stability, and curing behavior were systematically studied. The results showed that, compared with two other types of silane coupling agents, one silane agent (KH570) had a larger positive effect on the rheology and stability of the AlN suspension, and the absorbance of the AlN powder increased after surface modification. In addition, the effects of different solid loadings on the curing behavior and CC double-bond conversion rate were systematically investigated. It was found that a higher solid loading resulted in a lower curing depth, cure width, and CC double-bond conversion rate. For the sintered AlN components with increased solid loading, the shrinkage decreased while both the flexural strength and thermal conductivity increased. In addition, the shrinkage in the Z-direction was higher than that in the X- and Y-directions. Scanning electron microscopy analysis showed that the mean grain size decreased with increasing solid loading. Furthermore, a heat dissipation performance evaluation system was designed to illustrate the heat transmission capacity of AlN ceramics. Simulation and experimental results showed that AIN ceramic parts with complex shapes achieved better heat-dissipation performance than those with simple shapes.

The Effect of Silane Coupling Agent on the Texture and Properties of In Situ Synthesized PI/SiO2 Nanocomposite Film

PI/SiO2 composite films have been prepared by using in situ polymerization. The influences of the dosage of silane coupling agent (KH-560) on the structure and performance of PI/SiO2 composite film have been investigated. The results show that in the components without KH-560, the addition of SiO2 decreases the transmittance of the sample. Compared to the same SiO2 doping amount, the transmittance in the visible light range of the sample using KH-560 is higher than that of the sample without KH-560. After adding KH-560, the tensile strength, the elastic modulus the elongation at break of the sample have largely changed. The thermal stability and the ability to resist ultraviolet radiation of the composite film first increases and then decreases. Furthermore, the optimal dosage of KH-560 is 3%. Moreover, the addition of KH-560 has little effect on the transmittance of the PI/SiO2 composite films before and after UV irradiation.

Molecular interaction of Asphalt-Aggregate interface modified by silane coupling agents at dry and wet conditions

This study investigated interfacial behavior of asphalt-aggregate system modified by silane coupling agents (SCA). Molecular dynamics (MD) were used to simulate the interface between asphalt binder and silica grafted with three SCAs with different functional groups. At dry condition, the transition zone thickness and contact angle between asphalt binder and modified aggregate surfaces were compared. At wet condition, the effects of SCAs on interaction energy and hydrogen bond were analyzed. The simulated results are in good agreement with experimental measurements reported in the literature. It was found that the SCA modification could improve the adhesion between asphalt and aggregate at both dry and wet conditions. The thicker transition zone between asphalt and aggregate after SCA modification could enhance the compatibility and improve the force transfer between asphalt and aggregate. In addition, the wettability of asphalt binder on the SCA-modified aggregate surface was found better from the simulated contact angle. The grafted SCA on aggregate surface increased the resistance of asphalt-aggregate interface to moisture damage through increased interaction energy and less potential of hydrogen bonds. Although all three types of SCAs had positive benefits on interfacial bonding of asphalt-aggregate systems, the SLA with amino group showed superior performance.

Development of Surface Coating based Hybrid Acrylic Copolymers for Coating Application, Preparation, Characterization and Processing

In this study, series of hybrid emulsion copolymers with different composition ratios of acrylic acid, methylacrylicacid with butyle-acrylate, methyl-metha-acrylate, polyvinyl alcohol were generated. The preparationwas performed in a batch reactor on an industrial scale to obtain the resulting resin. While applying variousprocesses of emulsion polymerization, batch polymerization was chosen to find optimum conditions byinvestigating the parameters of the monomer percentages, initiators, temperature and time. Dodecyl BenzeneSulphonic acid SDBA as emulsifier, as well as sodium dodecyl sulfonic acid SDBAS as co-emulsifier asredox couple initiator have been chosen as the best and most effective initiators to hybrid acrylic resinprocessing Water-dispersed acrylic resin was developed as a hydrophilic monomer, utilizing acrylic acid.To avoid gelatin and agglomeration, the reaction temperature of the acrylic resin preparation was takenfor 4 hours at 70oC. To understand the effect of silane coupling agent on the properties of hybrid emulsioncopolymers, in the presence of trimetyl-chloro saline. FTIR spectroscopy, 1HNMR spectra, thermal analysisas well as mechanical tests were widely studied confirmation of the hybrid acrylic resins. The various physicchemicalproperties of hybrid emulsion acrylic copolymers including density, viscosity, chemical resistanceand volatile matter were studied. The results show that hybrid emulsion acrylic copolymers are readilysoluble in aprotic polar solvents such as (Toluene, Acetone, Benzene, xylene, DMF, DMSO, Methanol, andethanol) without being in need for heating. The emulsion copolymers obtained had a great solid content aswell as have been used as binder in emulsion paints. These polymers have very useful properties such ashigh anticorrosive and chemical resistance, the experimental results reveal.

RETRACTED: Modular monomers with adjustable solubility: Synthesis of block copolymers for improved photocatalysis by RAFT for the synthesis of atomic nickel co-catalysts

• The loading of Ni on TiO 2 in the prepared composite is in atomic form, and the efficiency of photocatalytic hydrogen precipitation is better than that of the conventional loading method.Adsorption equilibrium process consistent with Langmuir adsorption isotherm and pseudo-second-order kinetics • Modular monomer method allows efficient identification of monomers suitable for RAFT water dispersion polymerization • The "nano-bridge" PMPS-MPS-P ([META + ][PF 6 − ]) plays an important role in the formation of stable Ni-O and Ti-C bonds, and can also influence the formation of Ov through ionic response • Can be modified by defect engineering to manipulate photocatalysts, providing a new idea for similar research directions Using the high incompatibility between the neutral stabilizer body and the block polyelectrolyte to drive phase separation during polymerization-induced self-assembly, a modular approach to systematically adjust ionic monomer/polymer solubility was developed to effectively identify monomers suitable for RAFT aqueous dispersion polymerization, with strong phase separation ability to form worm phases over a wide range of compositions and even at very low solids content. The block copolymer PMPS-MPS-P([META + ][PF 6 − ]), prepared by this method, acts as a "nano bridge" and achieves Ni loading on TiO 2 with the help of sol-gel method + thermal reduction. The atomic loading of Ni on TiO 2 is achieved through strong covalent bonding, metallic bonding and the natural physical intertwining effect of silane coupling agent. Interestingly, it was unexpectedly found that the TiC stable structure generated by this process, the ionization of part of the block polyelectrolyte after the thermal reduction treatment at 773 K and the loading process of Ni all can promote the formation of oxygen vacancy Ov, which facilitates the charge transfer and hydrogen precipitation reaction. It has superior photocatalytic ability and cheaper cost compared to the conventional impregnation dispersion method. These findings provide a new idea to modify the manipulated photocatalysts by defect engineering to achieve efficient photocatalytic efficiency and capability.

Silane coupling agent on the structure and properties of polymethyl methacrylate silica nanocomposites

Nanocomposite materials use matrix resin and rubber as continuous phases, and modifier semiconductor nanometers and nanometals as dispersed phases. The modifier is evenly dispersed into the body material according to a certain preparation method. Compound mechanism. This article aims to study the effect of silane coupling agent on the structure and properties of polymethyl methacrylate silica nanocomposites. This article mainly uses nano-silica as the basic material and uses organic functional molecules for modification to prepare three new materials that can selectively adsorb gold ions, which provides new ideas for the concentration and recovery of gold ions. This paper mainly uses the isotherm adsorption algorithm to calculate the relationship between the concentration of different adsorbate and adsorption capacity at a specific temperature for nanocomposites. The experimental results in this paper show that polymethyl methacrylate silica nanocomposites can selectively adsorb gold ions, the maximum adsorption capacity is 127.3 mg/g, the adsorption equilibrium time is 20 min, and the optimal adsorption pH is 3.

Effect of silane coupling agent on compatibility interface and properties of wheat straw/polylactic acid composites

To improve the performance of wheat straw/polylactic acid (WS/PLA) composites, four different silane coupling agents were used for constructing compatible interfaces and then examined by scanning electron microscopy, Fourier transform-infrared spectroscopy, X-ray diffractometry and thermogravimetric analysis. The blending and tensile strengths of silane-modified composites were effectively enhanced, with KH-570-modified composite exhibiting the best blending and tensile strengths. Water resistance analysis of silane-modified composites was reduced and contact angles larger, indicating that water resistance performance of this composite had been effectively improved. The KH-570-modified composite exhibited the best water resistance performance. Strain scanning showed that, in the linear viscoelastic region, the storage modulus (G') of modified composite was larger than that of unmodified composites. Frequency scanning showed that the G' and complex viscosity (η*) of modified composites were greater than those of unmodified composites. From strain analysis and frequency scanning, the modified performance of the silane agent was observed to effectively improve composite interfacial compatibility, with KH-570-modified composite exhibiting the best effect. XRD analysis showed that silane coupling agent modification improved the crystallinity of composites with the improvement of KH-570 the best. And the thermal stability of silane-modified composites was improved and the thermal stability of KH-570-modified composite the best.

Effect of silane coupling agents on flowability and compressibility of compound for bonded NdFeB magnet

Based on the difference of the Y-terminal functional group of the silane coupling agent (Y–Si(X)3), four different silane coupling agents were employed to pretreat the surface of the NdFeB powders. The effects of silane coupling agents on the flowability and compressibility of compounds for preparing bonded NdFeB magnets were studied. It is indicated that compounds pretreated by silane coupling agents have weaker friction and meshing force. The apparent density is increased by 0.3 g/cm3 compared with the compound without silane coupling agent, and the radial crushing strength is significantly increased by about 3–4 times. In addition, the epoxy resin is more evenly distributed on the surface of the compounds treated by silane coupling agents observed by scanning electron microscopy, and some agglomerated particles are produced. Also, the compressibility of compounds with silane coupling agents is significantly improved due to the fact that hardening exponents are reduced. However, the addition of silane coupling agents has almost no effect on the magnetic properties of bonded magnets. The special energy was used to manifest the flowability of magnetic powder particles representing the macroscopic performance of the force between powder particles, providing a new direction for the study of the interface compatibility of two-phase or multiphase composite materials.

Effect of Silane Coupling Agent on Improving Adhesive Property between Acidic Aggregate and Hydraulic Asphalt

AbstractSilane coupling agents (SCAs) are a type of antistripping agent for improving the adhesive property between acidic aggregate and hydraulic asphalt. To evaluate the modified effect, find the...

Effect of Silane Coupling Agent on the Properties of Recycled Carbon Fibers Reinforced Bio-based Epoxy Composites

In this work, the effect of a silane coupling agent on the mechanical behavior of recycled carbon fiber reinforced bio-based epoxy composites was studied. For this purpose, the surface of the recycled carbon fiber was treated with 3-aminopropyltriethoxysilane (APS) agent at the concentrations in the 0–8 wt.% range. Dynamic mechanical analysis and characterization of the tensile and flexural properties were performed to observe the mechanical behavior of the specimens, and the morphology of the fracture surface after mechanical testing was also studied by scanning electron microscopy. It was found that the glass transition temperature and the tensile and flexural strengths of the composites increased with an addition of a suitable amount of the silane agent (< 4 wt.%), which was attributed to the cross-linking and curing reaction between the amino groups of APS and the epoxy matrix that improved the interfacial bonding. Thus, an appropriate concentration of the silane coupling agent can improve the mechanical properties of recycled carbon fiber reinforced bio-based epoxy composites.

Effect of silane coupling agent on the mechanical steel of sugarcane baggase and polypropylene composites

A composite material is produced by combining two or more materials to give a specific combination of properties, one consisting of rigid, long fibres and the other a binder or ‘matrix’ holding the fibres in place. Compared to the matrix, the fibres are strong and stiff, typically orthotropic. More recently, natural fibres were used in plastics. The broad availability of natural fibre in India, such as Jute, Coir, Sisal, Pineapple, Ramie, Bamboo, Banana, etc., pays specific attention to the manufacture of natural fibre composites to pursue value-added applications. This natural fibre composites are well suited to substitute wood in homes and manufacturing. Natural fibre reinforcement in composites has recently drawn ads due to low cost, low density, fair basic features, fast separation, improved energy recovery, CO2 neutrality, biodegradability and recyclability. Thousands of tonnes of different crops are made, but most of their waste is useless. It contains wheat husk, rice husk and grass, hemp fibre and dried fruit shells. These agricultural waste may be used for fibre-reinforced polymer composites for commercial usage. This project explores the impact of the silane binding agent on the mechanical properties of the sugar cane baggase and polypropylene compounds. Coupling agent is the agent used to strengthen the connection between the reinforcement and the matrix. In this plant, silane was used as a binding agent for sugar cane bagasse bio-composites. Reinforcement content treated with a binding agent at varying concentrations of 0 per cent, 10 per cent, and 20 per cent. This element was present in the compression moulding method for the manufacture of composite boards. The influence of the silane binding agent on the mechanical properties of the composites, such as the tensile, flexural and impact forces, was evaluated.

Effect of silane coupling agent on the rheological and mechanical properties of alkali-activated ultrafine metakaolin based geopolymers

Fluidity modification on geopolymer without changing its compositions is necessary. This study, firstly, investigated the optimal oxides molar ratios of geopolymers, then rheology, rheokinetics, fluidity and mechanical properties tests were conducted to study the influence of silane coupling agent (SCA) on geopolymers. Finally, characterization techniques of SEM, pore size distribution, FTIR and DSC were used to reveal the mechanisms. The results show when SiO2/Al2O3 = 3.4, M2O/Al2O3 = 1, and H2O/M2O = 11, geopolymer’s fluidity reaches 144 mm with the best compressive strength. The addition of 2 wt% SCA can reduce viscosity, increasing the fluidity to 167 mm, while excessive SCA can’t. SCA can also increase the viscosity growth rate and influence the microstructure of geopolymers.

Recent Progress in Silane Coupling Agent with Its Emerging Applications

This paper presents the effects of silane coupling agent, which includes interfacial adhesive strength, water treatment, polymer composites and coatings that make it valuable for multi-materialization. The methoxy-type silane coupling agent composites-based modification is discussed using different methods exhibiting higher reactivity towards hydrolysis. The characteristics of developed vulcanization, in particular the dimethoxy-type silane-coupling agents than the trimethoxy-type have improved properties such as environment friendly fabrication process, mechanical, physical, swelling and dynamic viscoelastic properties of composites. The modification of aggregated surface along with asphalt binder excel their properties. Specifically, the silane coupling agent (SCA) Glycidoxypropyl trimethoxysilane (KH-560) utilization realizes the modification purpose. This review focuses on synthetic approaches, surface modification, surface thermodynamic properties, techniques, salinization reaction and recent development in use of silane modifiers in various applications.

Effect of Silane Coupling Agent on Flexural Strength and Hardness of Wheat Straw Polystyrene Composites

In the present research work, the effect of silane treatment along with alkali treatment on flexural strength, flexural modulus, and hardness investigated. Wheat straw as a filler was added (5%, 10%, 15% and 20%) to polystyrene matrix to prepare wheat straw polystyrene composite. The wheat straw fibre was first treated with 20% NaOH and 1% silane coupling agent to prepare wheat straw polystyrene composite. The compounding process was carried out in twin-screw extruder and samples were prepared by the compression moulding process. There was an increase in flexural modulus (214%), flexural strength (44%), and hardness (28%) of composite with the addition of alkali and silane treated wheat straw fibre.

Effect of Silane Coupling Agents on Cotton Fibre Finishing

ABSTRACT Five different silane coupling agents such as vinyltrimethoxysilane (VTMS), vinyltriethoxysilane (VTES), trimethoxysilylpropylmethacrylate (TSPM), glycidoxypropyltriethoxysilane (GPTES) and aminopropyltriethoxysilane (APTES) were used for the surface finishing of cotton fiber by condensation polymerization in ethanol/water medium. The finished cotton fiber showed improved textile properties like tensile strength, wear comfortness, moisture absorption and wrinkle recovery, but decreased swelling in aqueous solution. The finished cotton fibers were characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Energy Dispersive X-ray (EDX), thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG). Attachment of silane coupling agents was confirmed and the finished cotton fiber showed increased thermal stability than the unfinished cotton. The finished cotton fiber showed higher reactive dye exhaustion due to silane coupling agent imparts new reactive sites for dye molecule on cotton fiber. The finished cotton fiber showed excellent fastness properties like washing, sunlight and chemical fastness properties. Improved textile properties of the silane finished cotton fiber with higher flexibility due to the presence of Si-O bond between the silane coupling agents and the cotton fiber, causes increased wear comfortness. Possible applications include use of the finished fibers as textile materials and garments.

Effect of Silane Coupling Agent on Modification of Areca Fiber/Natural Latex.

In this paper, the areca fiber was extracted by physical and chemical treatment, and then the areca fiber/natural latex composite was prepared by natural latex impregnation technology. In order to combine areca fiber and natural rubber latex better, three silane coupling agents with different action mechanism were selected: Si−69, KH550, and KH570 which were used to treat the areca fiber/natural latex compound. The results show that the silane coupling agent can change the surface of the fiber from hydrophilic surface to organophilic surface, making the bonding of areca fiber to natural latex more closely. At the same time, the mechanical properties, physical and mechanical properties, swelling properties, and dynamic viscoelastic properties of the tightly bonded areca fiber/nature latex composites were improved. After observing the micro-structure through a scanning electron microscope, it was found that the three silane coupling agents could effectively bind areca fiber and natural latex to enhance the performance of the composite material, of which Si−69 performed best, and the tensile strength and tear strength of the composite increased by 21.19% and 12.90% respectively.