Preparation and Performance of UV-Curing Thermal Conductive Silicone Rubber Composites
Using vinyl-functionalized polysiloxane and thiol-functionalized polysiloxane as the substrate,spherical Al2O3 as thermal conductive filler,the influences of spherical Al2O3 filler characteristics(particle size and content)on the thermal con-ductivity,UV-curing kinetics and mechanical properties of thermal conductive silicone rubber composites were investigated.UV-curing kinetics result indicates that when Al2O3 increases from 100wt%to 300wt%,the UV-curing time increases from 50 s to150 s.As the double bonds conversion is also decreased with more Al2O3 fillers,and it is lower than 15%after 70 s UV-curing in 400wt%of Al2O3.Although the curing rate of silicone rubber is affected by Al2O3 fillers,it outperforms the traditional curing silicone rubber.The results show that the thermal conductivity of silicone rubber is improved by mixture of Al2O3 particles with different size.More Al2O3 fillers will also enhance the thermal conductivity of silicone rubber,and the UV-cured silicone composite has thermal conductivity of 1.022 W/(m·K)with400wt%Al2O3 fillers.
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