▎ 摘　　要

NOVELTY - Preparing phase change graphene composite material comprises (i) modifying graphene oxide by dispersing graphene oxide in solvent, adding titanate coupling agent TCA-44, adding aqueous ammonia to adjust pH, and filtering to obtain modified graphene oxide, (ii) dissolving pyromellitic dianhydride and 4,4'-diaminodiphenyl ether in solvent, adding modified graphene oxide, isoquinoline and p-toluenesulfonic acid, polymerizing, and carrying out amidation to obtain heat-conducting polyimide solution, (iii) diluting heat-conducting polyimide solution as shell solution for coaxial electrospinning, dissolving phase change material in solvent, using as inner layer solution, and performing coaxial electrospinning to obtain a composite nanofiber membrane, and (iv) soaking composite nanofiber film obtained in the step (iii) in a mixed solution comprising vitamin C and aqueous ammonia, carrying out microwave reduction treatment, taking out film material and drying to obtain the finished product. USE - The material is useful as battery pack radiating material (claimed). ADVANTAGE - The method: grafts and modifies graphene oxide to introduce active amino groups, so that it can be chained into the molecular chain of polyimide during the polymerization process of polyimide; improves compatibility and dispersion of graphene oxide and polyimide, and radiating performance of composite material as a whole; utilizes coaxial electrospinning technology to coat the phase change material inside the thermally conductive polyimide nanowire fiber; makes the phase change material work without overflowing; and can better improves radiating effect. DETAILED DESCRIPTION - Preparing phase change graphene composite material comprises (i) modifying graphene oxide by dispersing graphene oxide in solvent, adding titanate coupling agent TCA-44, then adding aqueous ammonia to adjust pH, stirring and reacting at room temperature, and filtering to obtain modified graphene oxide, (ii) dissolving pyromellitic dianhydride and 4,4'-diaminodiphenyl ether in a solvent, then adding modified graphene oxide obtained in the step (i), isoquinoline and p-toluenesulfonic acid, heating to polymerization temperature, carrying out polymerization reaction, completely reacting, continuously heating to imidization temperature, carrying out amidation, and completely reacting to obtain heat-conducting polyimide solution, (iii) diluting heat-conducting polyimide solution obtained in the step (ii) as shell solution for coaxial electrospinning, dissolving phase change material in solvent, using as inner layer solution, then setting electrospinning process parameters to perform coaxial electrospinning to obtain a composite nanofiber membrane, and (iv) soaking composite nanofiber film obtained in the step (iii) in a mixed solution comprising vitamin C and aqueous ammonia, carrying out microwave reduction treatment, taking out film material and drying to obtain the finished product. An INDEPENDENT CLAIM is also included for a phase change graphene composite material prepared by the above-mentioned method.