▎ 摘　　要

NOVELTY - Polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material having glass transition temperature of 120-125 degrees C comprises methyl methacrylate as first monomer, methyl methacrylate as a first monomer. The trimethyl vinyl benzyl ammonium chloride is used as the second monomer which is prepared by suspension polymerization. The second monomer with positive charge is copolymerized with the first monomer to obtain a positive charge with a conjugated benzene ring copolymer, and graphene oxide itself is negatively charged and contains large pi-bonds, and formed electrostatic attraction and pi-pi interaction with the positively-charged copolymer to limit the movement of the polymer molecular chain in the suspension polymerization system. USE - Polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material. ADVANTAGE - The polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material is successfully improves the dispersion of graphene oxide in the matrix and solve the problems of PMMA material in terms of mechanical properties and thermal properties. DETAILED DESCRIPTION - Polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material having glass transition temperature of 120-125 degrees C. The polymethyl methacrylate-trimethylvinyl benzyl chloride-graphene oxide composite material uses methyl methacrylate as a first monomer. The trimethyl vinyl benzyl ammonium chloride is used as the second monomer which is prepared by suspension polymerization. The second monomer with positive charge is copolymerized with the first monomer to obtain a positive charge with a conjugated benzene ring copolymer, and graphene oxide itself is negatively charged and contains large pi-bonds, and formed electrostatic attraction and pi-pi interaction with the positively-charged copolymer to limit the movement of the polymer molecular chain in the suspension polymerization system. The volume ratio of the water phase to the oil phase is (2.5-4.5):1. The oil phase is composed of a first monomer and a second monomer, and the amount of the first monomer is the oil phase 92-97 wt.% mass, and the amount of the second monomer is 3-8 wt.% oil phase. The water phase is composed of water, graphene oxide, a dispersant and a surfactant, where mass of the dispersant is 2.5-3 wt.% of the mass of the oil phase. The mass of the surfactant is 0.1-0.15 wt.% mass of the oil phase, and the mass of graphene oxide is 0.01-2 wt.% oil phase. The polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material is prepared by adding graphene oxide, a dispersant and a surfactant in water, uniformly dispersed by ultrasonic, adding the liquid prepared to the mixed solution of methyl methacrylate and trimethylvinyl benzyl ammonium chloride, stirring, and passing in a protective gas to keep it in a protective gas atmosphere throughout the reaction. The temperature is raised above the initiation temperature of the initiator, and an initiator is added to initiate polymerization, and copolymerization is performed to obtain a methyl methacrylate-trimethylvinylbenzyl chloride-graphene oxide copolymer. The initiator The amount is 0.8-1.8 wt.% mass of the oil phase. The prepared copolymer is filtered and washed, after drying to obtain copolymer powder. INDEPENDENT CLAIMS are included for following: (1) a method for preparing a polymethylmethacrylate-trimethylvinylbenzyl ammonium chloride-graphene oxide composite material, which involves adding graphene oxide, dispersant and surfactant to the water, and disperse it uniformly by ultrasound, adding prepared liquid to an oil phase mixed solution of methyl methacrylate and trimethyl vinyl benzyl ammonium chloride, where amount of methyl methacrylate is the mass of the oil phase 92-97 wt.% trimethylvinyl benzyl chloride is 3-8 wt.% the mass of the oil phase, the mass of the dispersant is 2.5-3 wt.% the mass of the oil phase, and the mass of the is oil phase surfactant is 0.1-0.15 wt.%, and the mass of the graphene oxide is 0.0l-2 wt.% the mass of the oil phase, and the stirring is continued, and a protective gas is introduced to maintain the protective gas atmosphere in the entire reaction process, raising temperature above the initiation temperature of the initiator, and adding initiator at the same time to initiate polymerization and copolymerize to obtain methyl methacrylate-trimethylvinyl benzyl chloride-graphene oxide copolymer, and the amount of the initiator is 0.8-1.8 wt.% the mass of the oil phase, filtering and washing prepared copolymer to obtain copolymer powder, after drying; and (2) a method for using trimethyl vinyl benzyl ammonium chloride and graphene oxide in synergistically increasing the glass transition temperature of methyl methacrylate-based polymers, which involves copolymerizing trimethylvinyl benzyl chloride with positive charge with methyl methacrylate to obtain positively charged copolymer with a conjugated benzene ring, where graphene oxide itself is negatively charged and contained large pi bonds which form electrostatic attraction and pi-pi interaction with the positively-charged copolymer to limit the movement of the polymer molecular chain.