▎ 摘　　要

NOVELTY - A polyimide-grafted polyethylene glycol composite solid-solid phase change material comprises polyimide, graphene oxide and polyethylene glycol as main ingredients. The phase change material with a crosslinking porous layered structure is prepared by carrying out graft copolymerization between the polyimide precursor and polyethylene glycol and performing thermal crosslinking of polyimide precursor cooperate with each other. USE - Polyimide-grafted polyethylene glycol composite solid-solid phase change material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for Preparation of the polyimide-grafted polyethylene glycol composite solid-solid phase change material, which involves: (1) preparing a mixed solution of graphene oxide modified polyimide precursor by weighing pyromellitic dianhydride and 4,4'-diaminodiphenyl ether according to the mass ratio of the certain substance, adding 4,4'-diaminodiphenyl ether to a 250 ml three-necked flask, then adding a certain amount of N,N-dimethylformamide and a certain amount of graphene oxide for ultrasonic dispersion, then transferring to ice bath to carry out mechanical stirring, dividing pyromellitic dianhydride into three portions, adding to the three-necked flask at equal intervals and continuously stirring; and (2) preparing the phase change material by adding molten polyethylene glycol to the mixed solution of graphene oxide-modified polyimide precursor according to a certain mass ratio, evenly stirring and drying in a blast drying oven, cooling and crystallizing, then transferring to an alumina porcelain boat, and placing the boat in a high temperature tubular furnace for thermal crosslinking.