▎ 摘　　要

NOVELTY - Preparing high dielectric constant polyimide composite material, involves (a) dissolving graphene oxide in dimethylformamide to obtain a graphene oxide solution, adding cobalt ions and terephthalic acid to the solution, filtering, and drying the precipitate to obtain cobalt-metal-organic framework/graphene oxide, (b) dissolving the graphene oxide in water to obtain solution, adding sodium alginate, and adding calcium chloride solution to the solution to obtain cobalt-metal-organic framework/graphene oxide microspheres, (c) reducing the microspheres to obtain cobalt-metal-organic framework/reduced graphene oxide microspheres, (d) dissolving nano- barium titanate in N,N-dimethylacetamide, and ultrasonically processing to form a dispersion, (e) adding microspheres, ultrasonically processing to form a solution, dispersing the microspheres, and ultrasonically processing, (f) adding polyamic acid, and ultrasonically processing, and (g) coating suspension on a glass plate, and heating. USE - The method is useful for preparing high dielectric constant polyimide composite material (claimed). ADVANTAGE - The prepared material improves the dielectric constant, and has excellent mechanical properties. DETAILED DESCRIPTION - Preparing high dielectric constant polyimide composite material, involves (a) dissolving graphene oxide in dimethylformamide to obtain 1-5 mg/ml graphene oxide solution, adding cobalt ions and terephthalic acid in a molar ratio of 1:(0.5-2) to the graphene oxide solution, reacting at 90-120 degrees C for 15-25 hours, filtering, and drying the precipitate to obtain cobalt-metal-organic framework/graphene oxide, where the molar ratio of cobalt ions to graphene oxide is (2-5):1, (b) dissolving the cobalt-metal-organic framework/graphene oxide in water to obtain 0.01-0.05 g/ml solution, adding 0.02-0.06 g sodium alginate/ml, stirring at 90-95 degrees C for 1-3 hours, and adding 3-5 times 4 wt.% calcium chloride solution to the solution to obtain cobalt-metal-organic framework/graphene oxide microspheres, (c) reducing the microspheres to obtain cobalt-metal-organic framework/reduced graphene oxide microspheres, (d) dissolving nano-barium titanate in N,N-dimethylacetamide, and ultrasonically processing for 1-3 hours to form a dispersion of 3-10 mg/ml, (e) adding microspheres, ultrasonically processing for 1-2 hours to form a solution of 5-20 mg/ml, evenly dispersing the microspheres, and continuously ultrasonically processing for 1-2 hours, (f) adding 2-8 times polyamic acid, and ultrasonically processing for 20-30 hours to obtain a suspension, and (g) coating the suspension on a glass plate, heating at 100-120 degrees C for 1-2 hours, heating at 200-210 degrees C for 1-2 hours, and heating at 300-310 degrees C for 1-2 hours.