▎ 摘　　要

NOVELTY - Preparation of polyacrylonitrile/graphene composite material involves using ultrasonic wave auxiliary grafting method for covalent modification of graphene surface using polyacrylonitrile under the action of evocating agent to obtain polyacrylonitrile/graphene suspension. USE - For preparation of polyacrylonitrile/graphene composite material (claimed). ADVANTAGE - The method is simple, avoids using high toxicity acrylonitrile monomer, has stable structure, has low cost, is convenient and is green and non-toxic, it can realize large-scale industrial production of polyacrylonitrile/graphene composite material, and is environmentally-friendly. The polyacrylonitrile/graphene oxide suspension liquid obtained has good stability. The acrylonitrile/grapheme composite solution obtained can be dispersed uniformly and can be stored for a long time. The final product has high yield, and has good industrial application prospect. DETAILED DESCRIPTION - Preparation of polyacrylonitrile/graphene composite material involves using ultrasonic wave auxiliary grafting method for covalent modification of graphene surface using polyacrylonitrile under the action of evocating agent to obtain polyacrylonitrile/graphene suspension. The method preferably involves: 1) putting the graphite or graphene oxide (1 pts.wt.) into solvent (5-1000 pts.wt.), and stirring the mixed solution for 1-20 hours to form graphene suspension (where mass fraction of the solvent is 30-60%, and the solvent is aqueous solution of sodium thiocyanate, N-methyl pyrrolidone, water, ethanol, isopropyl alcohol, dimethyl sulfoxide, N,N-dimethyl formamide, N,N-dimethyl acetamide or aqueous solution of zinc chloride); 2) mixing polyacrylonitrile (0.1-100 pts.wt.) with solvent, using a certain auxiliary dissolved method to give polyacrylonitrile solution (mass concentration of 1-11%) (where mass fraction of solvent is 30-60%, and the solvent is aqueous solution of sodium thiocyanate, N-methylpyrrolidone, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide or aqueous solution of zinc chloride), and auxiliary dissolving method involves heating and stirring to dissolve, ultrasonic auxiliary dissolving and/or high speed cutting auxiliary dissolving method; 3) mixing and stirring initiator mixed solution of step (1) with step (2) solution for 1 minute to 2 hours to obtain the mixed solution, where the mass ratio of the polyacrylonitrile/graphene oxide material is 0.01-10, where the initiator is dibenzoyl peroxide, azobisisobutyronitrile, azobis-valeronitrile, sodium persulfate, potassium persulfate, ammonium persulfate, azobisisobutyronitrile, butyramidine hydrochloride or azobis isobutyrate imidazoline hydrochloride mixed solution, and the weight ratio of the initiator is 0.1-20% of the graphene; 4) reaction of the step (3) solution under ultrasonic condition for 0.5-20 hours, the temperature of the ultrasonic system is 0-100 degrees C to obtain the polyacrylonitrile/graphene composite solution, the ultrasonic wave treatment includes an ultrasonic bath and/or ultrasonic probe, in ultrasonic bath, the ultrasonic power is 20-4000 W, and the ultrasonic working frequency is 20-120KHz, and in ultrasonic probe, the ultrasonic power is 50-3000 W, and the frequency is 20-120KHz.