▎ 摘　　要

NOVELTY - A graphene oxide/N,N-dimethylformamide solution is prepared by dissolving 25-50 %mass dilute aqueous solution of graphite oxide in N,N-dimethylformamide and distilling under reduced pressure. After completion of distillation, the distillate is ultrasonically-treated. Polyvinylidene fluoride and carbon nanotubes are added to distillate, and magnetic-stirred, to obtain a mixture (m1). The mixture (m1) is ultrasonically treated and heated at 100-120 degrees C, to obtain viscous liquid. The viscous liquid is oven-dried, to obtain a polyvinylidene fluoride-ethylene thermally-conductive composite material. USE - Preparation of polyvinylidene fluoride-ethylene thermally-conductive composite material (claimed). ADVANTAGE - The method enables preparation of polyvinylidene fluoride-ethylene composite material having excellent thermal conductivity and mechanical property. DETAILED DESCRIPTION - A graphene oxide/N,N-dimethylformamide solution is prepared by dissolving 25-50 %mass dilute aqueous solution of graphite oxide in N,N-dimethylformamide and distilling under reduced pressure. The volume ratio of graphene oxide and aqueous solution of N,N-dimethylformamide is 2:1. After completion of distillation, the distillate is ultrasonically-treated. Polyvinylidene fluoride and carbon nanotubes are added to distillate, and magnetic-stirred at 80-90 degrees C for 3-6 hours, to obtain a mixture (m1). The mass ratio of polyvinylidene fluoride, carbon nanotubes and graphene oxide is 80-90:5-15:1-5. The mixture (m1) is ultrasonically treated at 80-90 degrees C and heated at 100-120 degrees C, to obtain viscous liquid. The viscous liquid is oven-dried at 50-80 degrees C, to obtain a polyvinylidene fluoride-ethylene thermally-conductive composite material.