▎ 摘　　要

NOVELTY - Preparing polyimide-based modified graphene thermally conductive composite material, comprises performing electrochemical exfoliation on graphite to obtain graphene nanosheets i.e. GNS, then reacting maleimide and graphene nanosheets by Diels-Alder reaction to obtain maleimide-modified graphene thermal conductive filler i.e. M-GNS and preparing maleimide-graphene/polyimide composite material i.e. M-GNS/PI by taking polyimide as matrix and M-GNS as filler and performing in-situ polymerization and chemical imide method. USE - The polyimide-based modified graphene thermally conductive composite material is useful in microelectronic package fields. ADVANTAGE - The method: can connect the carboxy-terminated PAA (polyamic acid) and functional graphene by C-N-C bond; enhancing the compatibility of graphene and matrix and thus obviously improve the heat-conducting performance of the polyimide composite material under the filling of low-content filler. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for polyimide-based modified graphene nanosheet composite material prepared by above method.