Abstract

In this study, mechanical and thermomechanical properties of porous silicone composites with various contents of hollow silica particles, treated by vinyltrimethoxysilane (VTMS) as a silane coupling agent, were investigated using tensile and dynamic mechanical analysis. Series of silicone composites with non-modified hollow silica particles as a reference were also prepared for comparative study. The surface characteristics of VTMS-modified hollow silica particles were analyzed using FT-IR spectroscopy. The vinyl function groups on VTMS-modified hollow silica particles led to a chemical bonding to silicone matrix, resulting in reinforcing the mechanical properties of the silicone composites. Tensile modulus of porous silicone composites without the surface modification of silica particles could be predicted by Einstein and Guth/Gold equations, implying the hydrodynamic reinforcement contribution. On the other hand, considerable improvement in the tensile modulus of silicone composites was achieved by strong interfacial adhesion created by chemical bonding on the surface of VTMS-modified hollow silica particles.

摘要

在这项研究中，使用拉伸和动态力学分析研究了以乙烯基三甲氧基硅烷 (VTMS) 作为硅烷偶联剂处理的具有不同含量空心二氧化硅颗粒的多孔有机硅复合材料的力学和热力学性能。还制备了一系列以未改性空心二氧化硅颗粒为参考的有机硅复合材料进行对比研究。使用 FT-IR 光谱分析了 VTMS 改性的空心二氧化硅颗粒的表面特性。VTMS 改性的中空二氧化硅颗粒上的乙烯基官能团导致与有机硅基体的化学键合，从而增强了有机硅复合材料的机械性能。没有二氧化硅颗粒表面改性的多孔有机硅复合材料的拉伸模量可以通过 Einstein 和 Guth/Gold 方程来预测，暗示水动力加固贡献。另一方面，有机硅复合材料的拉伸模量显着提高是通过 VTMS 改性空心二氧化硅颗粒表面的化学键合产生的强界面粘合力实现的。