▎ 摘　　要

NOVELTY - Oxidized graphene is dispersed in water and ultrasonically dispersed, to obtain aqueous dispersion of graphene oxide. An acrylonitrile monomer is added to aqueous dispersion and stirred. The mixture is microwave grafted, to obtain oxidized graphene-grafted polyacrylonitrile. The oxidized graphene-grafted polyacrylonitrile is washed and dried, to obtain graphene-grafted polyacrylonitrile. The graphene-grafted polyacrylonitrile is dispersed in solvent, and a reducing agent is added, microwave reduced, washed and dried, to obtain reduced graphene-grafted polyacrylonitrile. USE - Preparation of reduced graphene-grafted polyacrylonitrile used for highly-dielectric nanocomposite film (claimed) for electric application, motor, cable, artificial muscle, wave-absorbing material and drug release application. ADVANTAGE - The method enables preparation of reduced graphene-grafted polyacrylonitrile with high yield and repeatability by simple and economical method within short period of time, with low energy consumption. The nanocomposite film having high dielectric property and low dielectric loss is prepared using the reduced graphene-grafted polyacrylonitrile. DETAILED DESCRIPTION - Oxidized graphene is dispersed in water and ultrasonically dispersed, to obtain aqueous dispersion of graphene oxide. An acrylonitrile monomer is added to aqueous dispersion of graphene oxide, stirred, and initiator is added under protection of inert gas, stirred and evenly mixed. The mixture is added to microwave reactor and microwave grafted, to obtain oxidized graphene-grafted polyacrylonitrile. The oxidized graphene-grafted polyacrylonitrile is washed and dried, to obtain graphene-grafted polyacrylonitrile. The graphene-grafted polyacrylonitrile is dispersed in solvent, and a reducing agent is added, placed in microwave reactor, microwave reduced, washed and dried, to obtain reduced graphene-grafted polyacrylonitrile. An INDEPENDENT CLAIM is included for highly-dielectric nanocomposite film, which is prepared by mixing cyanoethyl cellulose as matrix, N,N-dimethylformamide as solvent and reduced graphene-grafted polyacrylonitrile as filler to form solution and casting solution to form film.