▎ 摘　　要

NOVELTY - Polyvinylidene fluoride composite material involves mixing 1 wt.% aqueous solution of graphene oxide with N,N-dimethylformamide, N,N-dimethylformamide in volume ratio of amide to aqueous solution of graphene of 1:2 and heating to obtain solution. The obtained solution placed into rotary distillation under reduced pressure to sonication for 0.5-2 hours to obtain N, N-dimethylformamide solution of graphene oxide. The poured the nano-silica into obtained graphene oxide N, N-dimethyl formamide solution in mass ratio of 100:2-20 to obtain mixed solution. USE - Method for polyvinylidene fluoride composite material (claimed). ADVANTAGE - The method enables to prepare polyvinylidene fluoride composite material, which has high dielectric constant, low dielectric loss and good mechanical performance. DETAILED DESCRIPTION - Polyvinylidene fluoride composite material involves mixing 1 wt.% aqueous solution of graphene oxide with N,N-dimethylformamide, N,N-dimethylformamide in volume ratio of amide to aqueous solution of graphene of 1:2 and heating to obtain solution. The obtained solution placed into rotary distillation under reduced pressure to sonication for 0.5-2 hours to obtain N, N-dimethylformamide solution of graphene oxide. The poured the nano-silica into obtained graphene oxide N, N-dimethyl formamide solution in mass ratio of 100:2-20 to obtain mixed solution. The obtained mixed solution subjecting under stirring condition for 0.5-1 hour and placing under sonication to obtain suspension of graphene and silica nano hybrid material. The polyvinylidene fluoride is mixed into N, N-dimethylformamide, heating at 45-55 degrees C for 2-3 hours to obtain solution of polyvinylidene fluoride in N, N-dimethylformamide. The obtained mixture is heated at 85-95 degrees C to obtain viscous liquid, and dried the viscous liquid in an oven at 60-90 degrees C to obtain dried material. The obtained dried material is placed under melt blending at 190-210 degrees C for 10 minutes and cooling to obtain the desired product.