▎ 摘　　要

Thermal conductivity of polymers can be increased by loading high thermal conductive materials like ceramic, carbon and metal-based or its mixtures. In this study, high thermal conductive and electrically insulating composites were manufactured using alumina/graphene hybrid filler mixtures. Graphene content of the filler mixtures was prepared at 0, 1, 3, 5 and 7% of total filler amount and alumina/graphene combinations of fillers loaded polypropylene (PP) matrix composites prototypes were produced at 3: 2 polymer/filler weight ratio by high speed thermo-kinetic mixer. Thermal and electrical behaviors of the composites were investigated by differential scanning calorimeter, simultaneous differential thermal analysis, thermal conductivity measurement equipment and electrical resistivity measurement equipment. It was observed that the crystallization temperatures of the composites increased with increasing amount of graphene in the composite. At the same time, it was observed that the thermal conductivity values started to rise after 5% of the initial drop by the increase of the amount of graphene in the composite. The thermal conductivity of the composites increased with the addition of graphene. No significant change in the electrical conductivities of the composite materials was observed.