▎ 摘　　要

In this work, a polymeric composite was prepared from ethylene propylene diene monomer (EPDM) and silicone rubber (S) with additives of modified fumed silica (MFS), titanium dioxide (TiO2) and graphene. The dielectric and thermal performances of the EPDM-based composites were studied. An increase in the dielectric constant and AC dielectric breakdown strength was observed for the EPDM rubber composites containing MFS, TiO2, and graphene additives. In addition, the incorporation of the additives resulted7in a significant increase in the thermal stability (similar to 30-50 degrees C) and thermal conductivity (similar to 7-35%) of the composites. The combination of these various improvements gives suitable performance advantage to the polymeric composite for use in insulating applications.