PREPARATION METHOD OF GRAPHENE POLYIMIDE COMPOSITE SPONGE PRECURSOR-BASED THERMAL-CONDUCTIVE FILM

摘要

#$%^&*AU2020102143A420201015.pdf#####Abstract The present application discloses a preparation method of a graphene polyimide composite sponge precursor-based thermal-conductive film, including the steps of: mixing a graphene oxide aqueous solution with a polyimide precursor solution to obtain a graphene oxide/polyamic acid mixed solution, and freezing the graphene oxide/polyamic acid mixed solution to obtain a graphene oxide/polyamic acid frozen sponge, drying by a freeze-drying method to obtain a graphene oxide/polyamic acid composite sponge, placing the graphene oxide/polyamic acid composite sponge in a resistance vacuum hot-pressing furnace, performing hot-pressing oxidation pretreatment and mechanical pressurization to obtain a reduced graphene oxide/polyimide composite film; and then performing vacuum thermal annealing and mechanical pressurization to obtain a graphene/polyimide carbon film, placing in a high-temperature graphitization furnace, and graphitizing the carbon film by adopting a gradient heating method. By adopting the technical solution of the present application, the dispersion of graphene is improved; and the obtained film has certain flexibility, high mechanical strength, better electrical and thermal conductivities, and the preparation process is simple.Drawings icecrystals graphene oxide/ polyamic in-situ polymerization method acid mixed solution cold sources freeze-drying method graphene oxide/ polyamic highly-oriented graphene acid mixed solution oxide/polyamic acid composite sponge oStres Stress graphitization treatment hot-pressing oxidation pretreatment hot-pressing oxidation carbonization treatment FIG.1 FIG.2