Effect of graphite and its surface modification on thermal conductivity of silicone rubber

Thermal conductive filler with reinforcing agent and crosslinking agent was dispersed in poly(methylvinyl siloxane) using a two-roll mill and the thermal conductive silicone rubber was obtained after curing in a mould. Effects of filler species, content and surface modificaton of graphite and its combination with carbon black on the properties of silicone rubber were systematically investigated. The results showed that at the same filler content the higher the coefficient of themal conductivity of filler was, the better the thermal conductivity of silicone rubber was. The coefficient of thermal conductivity of silicone rubber increased with the increase of the filler content. The surface modification of graphite improved the interfacial compatibility between graphite and silicone rubber, therefore the thermal conductivity and mechanical properties of silicone rubber increased. The silicone rubber with the com-plexed filler of graphite and carbon black having different sizes and morphology exhibited better the