▎ 摘　　要

NOVELTY - A pyrene ring-containing polythiophene-modified graphene thermal conductive filler is obtained by blending and modifying pyrene ring-containing polythiophene and graphene nanosheets. USE - Pyrene ring-containing polythiophene-modified graphene thermal conductive filler used for preparing thermally conductive composite material (claimed). ADVANTAGE - The method is capable of strengthening pi-pi interaction between the macromolecular modifier and graphene through the pyrene group, and enhancing heat transfer performance between graphenes, so as to significantly improve the thermal conductivity of the polyvinyl alcohol composite material under low filler content. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) preparation of the pyrene ring-containing polythiophene-modified graphene thermal conductive filler, which involves: (a) using 2-bromo-3-hexylthiophene as a raw material, performing lithium halide exchange reaction to obtain 2-boronic acid-3-hexylthiophene and performing Suzuki-Miyaura coupling reaction to obtain 1,3,6,8-tetrakis(3-hexylthiophene)pyrene; (b) performing electrophilic reaction with 1,3,6,8-tetrakis(3-hexylthiophene)pyrene as a monomer, to obtain polypyrene-3-hexylthiophene; (c) obtaining graphene nanosheets by electrochemical exfoliation of graphite; and (d) blending and modifying polypyrene-3-hexylthiophene and graphene nanosheets; and (2) preparation of thermally conductive composite material, which involves: (a) adding polyvinyl alcohol particles to deionized water, stirring and dissolving at 90degrees Celsius to obtain polyvinyl alcohol solution; and (b) adding the pyrene ring-containing polythiophene-modified graphene thermally conductive filler to the polyvinyl alcohol solution, uniformly stirring and dispersing, vacuum-filtering to obtain graphene nanosheets-doped polypyrene-3-hexylthiophene/polyvinyl alcohol composite film, and peeling off after drying to obtain graphene nanosheets-doped polypyrene-3-hexylthiophene/polyvinyl alcohol composite material.