▎ 摘　　要

NOVELTY - Preparing high-barrier graphene grafted chitosan composite material comprises (a) adding dichloromethane solvent, aminated graphene and p-azidobenzoic acid to a reaction beaker, ultrasonicating by ultrasonic dispersion device, adding 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide, reacting, distilling, washing and drying to obtain graphene azide, (b) adding pyridine as solvent, chitosan and catalyst into reaction beaker, sonicating, adding pyridine solution of propargyl butyric anhydride compound, heating, reacting, cooling, precipitating, washing, and drying to obtain alkynyl chitosan, and (c) adding N,N-dimethylformamide solvent and alkynyl chitosan into the reaction beaker, swelling, adding graphene azide, ultrasonicating to uniformly disperse, adding catalyst and co-catalyst, reacting, vacuum drying and washing, adding the product into glutaraldehyde solution, carrying out cross-linking reaction, vacuum degassing, curing and forming a film. USE - Th method is useful for preparing high-barrier graphene grafted chitosan composite material. ADVANTAGE - The method improves the interface force and compatibility of graphene and chitosan, reduces the agglomeration of nano-graphene particles, highly dispersed and uniform graphene forms a continuous three-dimensional structure network in the chitosan matrix, improves permeability of chitosan materials to oxygen and moisture and uses graphene as a chemical cross-linking site, so that the graphene grafted chitosan composite material exhibits excellent mechanical properties i.e. tensile strength.