▎ 摘　　要

NOVELTY - Preparation of modified graphene-polymethyl methacrylate composite film involves obtaining graphene oxide-aqueous dispersion by dispersing graphene oxide in deionized water, stirring with 7-amino-4-methylcoumarin, alkaline solution and chemical reducing agent, reacting to obtain modified mixture, filtering, washing, drying to obtain modified graphene, stirring with tetrahydrofuran, vibrating to obtain modified graphene-tetrahydrofuran dispersion, dissolving polymethyl methacrylate in tetrahydrofuran, stirring with obtained modified graphene-tetrahydrofuran, and drying. USE - Preparation of modified graphene-polymethyl methacrylate composite film (claimed). ADVANTAGE - The method enables simple preparation of modified graphene-polymethyl methacrylate composite film under mild reaction conditions. DETAILED DESCRIPTION - Preparation of modified graphene-polymethyl methacrylate composite film involves dispersing graphene oxide in deionized water, stirring at room temperature for 0.5-24 hours to obtain 0.01-3.0 mg/mL graphene oxide-aqueous dispersion, adding 7-amino-4-methylcoumarin, stirring at 20-50 degrees C for 0.1-12 hours, adding alkaline solution, stirring for 0.1-12 hours, adjusting the pH to 9-10, adding chemical reducing agent, reacting at 60-100 degrees C for 12-100 hours to obtain modified mixture, suction filtering to obtain mixture of solid matter, washing with ethanol and deionized water, placing in vacuum environment, drying at 40-80 degrees C to obtain 0.1-15 %mass modified graphene, adding tetrahydrofuran, stirring for 0.5-12 hours, ultrasonically vibrating for 0.5-24 hours to obtain 0.01-2.0 mg/mL modified graphene-tetrahydrofuran dispersion, preparing films by dissolving polymethyl methacrylate in tetrahydrofuran, stirring to obtain 1-10 %mass polymethyl methacrylate solution, adding obtained modified graphene-tetrahydrofuran, stirring for 0.1-8 hours, ultrasonically vibrating for 0.3-24 hours to obtain modified graphene-mixed solution of polymethyl methacrylate, placing in vacuum environment, and drying at 40-80 degrees C.