Influence of mica paper surface modification on the water resistance of mica paper/organic silicone resin composites

Abstract

This study enhances the water resistance of mica paper/organic silicone resin composites through surface modification with 3-aminopropyltriethoxysilane (APTES). The Fourier-transform infrared spectroscopy and the X-ray photoelectron spectroscopy confirmed the formation of chemical bonds between APTES and mica. The results showed that at an optimal APTES concentration of 0.6%, the water diffusion coefficient decreased from 5.0 × 10−3 mm²/min to 2.7 × 10−3 mm²/min, and the permeability coefficient decreased from 5.71 × 10−4 mm²/min to 1.94 × 10−4 mm²/min, with a significant reduction in equilibrium water uptake. Additionally, the modified composites exhibited minimal mechanical strength loss after moisture aging, demonstrating excellent water resistance. The interface shear strength tests revealed a 28.6% increase in interfacial bonding strength after APTES modification. This study demonstrates the potential of silane coupling agents to enhance the performance of inorganic polymer composites, providing theoretical support for their industrial application.