▎ 摘　　要

Polymer composites with high thermal conductivity have promising applications for the thermal management of modern electronic devices. Here, a novel strategy is proposed to enhance the thermal conductivity of epoxy composites by employing a hybrid graphene and boron nitride nanoparticle (GBN). In the GBN, boron nitride nanosheets (BNNSs) tightly adsorb onto the surface of graphene via pi-pi interactions, and act as bridges for conveying phonons as well as barriers for electrons transporting between adjacent graphene particles. The thermal conductivity and dielectric properties of composites containing GBN are then systematically investigated. The thermal conductivity is significantly enhanced (similar to 140%) in GBN/epoxy composites containing only 5 wt% of GBN. High electrical resistivity (3.05 x 10(12) Omega center dot cm) and low dielectric loss (tan delta < 0.08) are also observed. This study provides important insights into the design and fabrication of highly thermally conductive and electrically insulating composites. (C) 2020 The Authors. Published by Elsevier Ltd.