▎ 摘　　要

NOVELTY - Polystyrene-4-cyanostyrene-reduced graphene oxide composite material has glass transition temperature of 116-120 degrees C, styrene as the first monomer, 4-cyanostyrene as the second monomer. The copolymer obtained by copolymerization has a cyano-substituted benzene ring, and the reduced graphene oxide itself has a large pi bond (the surface of the reduced graphene oxide is composed of a six-membered carbon ring, and the carbon atoms are regularly arranged into a honeycomb structure, where each carbon atom is connected to other carbon atoms with a sigma bond, and the excess pi electrons and pi electrons of other carbon atoms form a delocalized large pi bond), forming a pi-pi interaction with the copolymer to limit copolymerization Of molecular chains. The polystyrene-4-cyanostyrene-reduced graphene oxide composite material is prepared by suspension polymerization in the suspension polymerization system. USE - Polystyrene-4-cyanostyrene-reduced graphene oxide composite material used for synergistically increase the glass transition temperature of styrene-based copolymers (claimed). ADVANTAGE - The polystyrene-4-cyanostyrene-reduced graphene oxide composite material is greatly increases glass transition temperature, and successfully improves the relationship between reduced graphene oxide and polymer matrix. The binding force solves the problem of polystyrene in use temperature. DETAILED DESCRIPTION - Polystyrene-4-cyanostyrene-reduced graphene oxide composite material having glass transition temperature of 116-120 degrees C, styrene as the first monomer, 4-cyanostyrene as the second monomer. The copolymer obtained by copolymerization has a cyano-substituted benzene ring, and the reduced graphene oxide itself has a large pi bond (the surface of the reduced graphene oxide is composed of a six-membered carbon ring, and the carbon atoms are regularly arranged into a honeycomb structure, where each carbon atom is connected to other carbon atoms with a sigma bond, and the excess pi electrons and pi electrons of other carbon atoms form a delocalized large pi bond), forming a pi-pi interaction with the copolymer to limit copolymerization Of molecular chains. The polystyrene-4-cyanostyrene-reduced graphene oxide composite material is prepared by suspension polymerization in the suspension polymerization system, the volume ratio of the water phase to the oil phase is (1.5-8.5):1. The oil phase is composed of styrene and 4-cyanostyrene. The amount of styrene is 70-90 wt.% oil phase. The amount of 4-cyanostyrene is 10-30 wt.% oil phase. The water phase is composed of water and a dispersant. The amount of the dispersant is 5-15 wt.% the sum of the masses of the two monomers, and the amount of the reduced graphene oxide is 0.5-4 wt.% sum of the masses of the two monomers. The dispersant is added to water and stirred until the dispersant is completely dissolved, then added styrene and 4-cyanostyrene to mix. The initiator is added to copolymerize, and the copolymerization temperature is above the initiation temperature of the initiator. The copolymerization is performed in a protective gas atmosphere to obtain styrene-4-cyanostyrene copolymer (PSCN). The amount of the initiator is 0.8-1.8 wt.% sum of the masses of the two monomers. The amount of dispersant is 5-15 wt.% sum of the masses of the two monomers. The copolymer prepared in step 1 is dissolved in chloroform to obtain a polymer solution having a concentration of 0.1 milligram per millilitre. The reduced graphene oxide is added to the chloroform, and the concentration is obtained after ultrasonic dispersion. The 2 milligram per milliliter reduced graphene oxide dispersion, and then the reduced graphene oxide dispersion are added to the polymer solution. The amount of the reduced graphene oxide is 0.5-4 wt.% based on the sum of the masses of the two monomers, and the stirring is continued for 20-40 minutes to obtain a copolymerization mixing system. The copolymer in obtained copolymerization and mixing system is precipitated, filtered, washed, and dried to obtain a composite material.