▎ 摘　　要

In this work, PA6/PA66/GNP thermal composites were prepared via a melt blending method. Mechanical properties, morphology and thermal properties of PA6/PA66/GNP composites were investigated. The thermal conductivity of composite containing 50 wt-% of graphene nanoplatelets was measured as 5.03 W m(-1) K-1 at 30 degrees C. When the Al2O3 was replaced for graphene nanoplatelets, the thermal conductivity of composites decreased, but the mechanical properties improved. The optimum amount of Al2O3 which replaced graphene nanoplatelets is 10%. When graphite was used to replace for graphene nanoplatelets, thermal conductivity basically remained unchanged but mechanical properties decreased.