▎ 摘　　要

NOVELTY - Preparing modified graphene oxide involves adding graphene oxide and 3-aminopropyltriethoxysilane into an ethanol water solution, and sequentially performing ultrasonic treatment and heating treatment to obtain aminated graphene oxide. The aminated graphene oxide is dispersed in toluene, added 4-dimethylaminopyridine and triethylamine, carried out ice bath for 20-30 minutes, slowly dropwise added 2-bromine isobutyryl bromide in the ice bath process, and reacted at room temperature for 24 hours to obtain bromine-terminated graphene oxide. The imidazole, dopamine hydrochloride and tert-butyldimethylsilyl chloride are placed in dichloromethane to react for 11-12 hours at room temperature, added methacryloyl chloride to react for 11-12 hours to obtain a monomer with a pyrocatechol group. USE - Method for preparing modified graphene oxide used for preparing epoxy nano composite material (claimed). ADVANTAGE - The modified graphene oxide helps to improve the compatibility with the epoxy resin matrix, and also improve the mechanical properties of the epoxy nano composite. DETAILED DESCRIPTION - Preparing modified graphene oxide involves adding graphene oxide and 3-aminopropyltriethoxysilane into an ethanol water solution, and sequentially performing ultrasonic treatment and heating treatment to obtain aminated graphene oxide. The aminated graphene oxide is dispersed in toluene, added 4-dimethylaminopyridine and triethylamine, carried out ice bath for 20-30 minutes, slowly dropwise added 2-bromine isobutyryl bromide in the ice bath process, and reacted at room temperature for 24 hours to obtain bromine-terminated graphene oxide. The imidazole, dopamine hydrochloride and tert-butyldimethylsilyl chloride are placed in dichloromethane to react for 11-12 hours at room temperature, added methacryloyl chloride to react for 11-12 hours to obtain a monomer with a pyrocatechol group. The bromine-terminated graphene oxide, monomer with the pyrocatechol group, glycidyl methacrylate, cuprous chloride and 4,4'-dinonyl-2, 2'-bipyridyl are reacted for 8-10 hours at 85degrees Celsius in a nitrogen atmosphere by taking N, N-dimethylformamide as a reaction solution to obtain an intermediate product. The intermediate product is reacted with tetrabutylammonium fluoride in a tetrahydrofuran solution for 5-6 hours, and removed tert-butyl protection. An INDEPENDENT CLAIM is included for a method for preparing epoxy nano composite material, which involves: (1) adding the modified graphene oxide into epoxy resin, stirring and uniformly mixing, and performing ultrasonic dispersion treatment; (2) continuously adding the curing agent, stirring and uniformly mixing, and then carrying out vacuum drying to remove bubbles; (3) pouring the system into a mold, and curing and forming to obtain the composite material.