Study on the Influence of Silane Coupling Agent Surface Modification on the Interfacial Properties of Glass Fiber Reinforced Nylon Composites
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Abstract
Poor interfacial compatibility in glass fiber reinforced nylon composites limits the full realization of their mechanical properties, with weak fiber-matrix bonding becoming a key bottleneck in engineering applications. This study uses γ-aminopropyltriethoxysilane to modify the surface of glass fibers and systematically investigates the effects of coupling agent concentration and treatment temperature on composite interfacial properties. APS concentrations of 0.5%, 1.0%, 1.5%, and 2.0 wt% and treatment temperatures of 80 ◦C, 100 ◦C, and 120 ◦C are examined. Scanning electron microscopy and Fourier transform infrared spectroscopy are used to characterize changes in fiber surface morphology and chemical structure, while single-filament tensile testing, monofilament pull-out testing, and interlaminar shear strength testing are used to evaluate interfacial bonding performance. Results show that as APS concentration increases from 0.5% to 1.5%, the Si-O-Si peak intensity increases by 108% and the N element content increases by 156%, indicating enhanced silane grafting. Excessive concentration leads to self-polymerization and reduced coating uniformity. The study clarifies the interfacial reinforcement mechanism of silane-modified glass fiber reinforced nylon composites.
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