▎ 摘　　要

NOVELTY - Polyimide-based thermally conductive composite material comprises polyimide, graphene, and silver nanoparticle, where graphene is dispersed in a polyimide substrate, and silver nanoparticle is loaded on surface of the graphene. USE - Polyimide-based thermally conductive composite material. ADVANTAGE - The polyimide-based thermally conductive composite material effectively prevents agglomeration of graphene by modifying silver nanoparticle on graphene, where silver nanoparticle act as bridge to construct heat conduction path between graphene sheets that is beneficial to increase thermal conductivity between graphene sheets, combines in-situ polymerization-spinning method to improve dispersion of silver-modified graphene in matrix, and is good for constructing graphene heat conduction network. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a polyimide-based thermally conductive composite material, which involves: (A) mixing graphene oxide dispersion liquid, silver ammonia solution and reducing agent, and subjecting it to reduction reaction to obtain a silver-modified graphene; (B) mixing silver-modified graphene, diamine monomer, dianhydride monomer and organic solvent under an inert atmosphere, and performing a polymerization reaction to obtain a spinning solution; (C) spinning the obtained spinning solution to obtain a spinning fiber; and (D) subjecting obtained spinning fiber to thermal imidization to obtain final product.