▎ 摘　　要

NOVELTY - Preparation of low dielectric constant graphene oxide/polyimide composite film includes under humidity of less than 50% and room temperature condition with mechanical stirring and nitrogen atmosphere, dissolving aromatic diamine in polar organic solvent, adding hyperbranched polyester-graphene oxide solution prepared from same polar organic solvent, continuously stirring, obtaining hyperbranched polyester-graphene oxide/diamine solution, adding aromatic dianhydride, stirring, obtaining graphene oxide/polyamic acid solution, adding aromatic dianhydride and stirring. USE - Preparation of low dielectric constant graphene oxide/polyimide composite film. ADVANTAGE - The low dielectric constant graphene oxide/polyimide composite film has high glass transition temperature and high tensile modulus. It has dielectric constant of 2.28, glass transition temperature of 386 degrees C, and tensile modulus of 4.41 GPa, compared with polyimide thin film having dielectric constant of 3.33, glass transition temperature of 355 degrees C and tensile modulus of 2.81 GPa. DETAILED DESCRIPTION - Preparation of low dielectric constant graphene oxide/polyimide composite film comprises under humidity of less than 50% and room temperature condition with mechanical stirring and nitrogen atmosphere, dissolving aromatic diamine in polar organic solvent, adding hyperbranched polyester-graphene oxide solution prepared from same polar organic solvent, continuously stirring for 1-1.5 hours, obtaining 6-9 mass% hyperbranched polyester-graphene oxide/diamine solution, where aromatic diamine is 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane or 2 2'-bis(trifluoromethyl)biphenyl-4 4'-diamine, adding aromatic dianhydride, where mol ratio of aromatic dianhydride and aromatic diamine is 1-1.1:1, stirring for 8-12 hours, obtaining graphene oxide/polyamic acid solution, uniformly coating in clean glass piece, placing in vacuum drying box to eliminate air bubbles, vacuumizing for 4-6 hours, heating at 70 plus minus 2 degrees C, keeping the temperature for 1.8-2.2 hours, heating at 120 plus minus 2 degrees C, keeping the temperature for 1-1.2 hours, heating at 150 plus minus 2 degrees C, keeping the temperature for 1.8-2.2 hours, heating at 200 plus minus 2 degrees C, keeping the temperature for 1-1.2 hours, heating at 300 plus minus 2 degrees C, keeping the temperature for 1-1.2 hours, cooling to room temperature, soaking in deionized water to remove the thin film, vacuum drying, and obtaining the product.