Abstract
The surface of BaTiO 3 particles was modified by 3-glycidoxypropyltrimethoxysilane (GPTMS) to attach epoxy groups on them and to improve their compatibility with epoxy resin. First, in order to analyze the effect of solvents on the degree of surface modification of BaTiO 3 particles, the surfaces of BaTiO 3 particles were modified with GPTMS in water, ethanol, and xylene at 80 °C. FT- nIR analysis showed that due to the ring-opening reaction, the epoxy group on BaTiO 3 particles was reduced after surface modification in ethanol and disappeared after surface modification in water. In contrast, when BaTiO 3 particles were modified in xylene, the epoxy groups remained. Then, the relationships among these surface structure differences, viscosity of BaTiO 3/epoxy/N-methyl-2-pyrrolidinon (NMP) suspensions, the surface morphologies of BaTiO 3/epoxy composites, and the dielectric properties of BaTiO 3/epoxy composites were investigated. While there was no relationship between the suspension viscosity and the dielectric properties of BaTiO 3/epoxy composites, a BaTiO 3/epoxy composite with a smooth surface and high dielectric properties was obtained when the BaTiO 3 surface was modified in xylene and the epoxy groups were effectively retained on the surface.
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