Alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and preparation method thereof

The invention discloses an alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer and a preparation method thereof, and belongs to the field of macromolecular polymerization.The preparation method comprises the steps that firstly, a monomer alpha-vinyltoluene, styrene and an initiator are added to a solvent to be dissolved, and the solution is heated to 80 DEG C to 110 DEG C; then, a semicontinuous sample introduction method is adopted for dropwise adding a solution containing maleic anhydride to a reaction system for 1 h to 3 h, and the reaction continues to be carried out for 30 min to 60 min after the solution is dropwise added; after the reaction is finished, the system is subjected to methyl alcohol precipitation, suction filtration and drying, and the alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer is obtained.The prepared alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer has the advantages that the content of maleic anhydride is high, and the glass transition temperature is low (low Tg facilitates machine shaping); meanwhile, an alpha-vinyltoluene structural unit is contained in the polymer chain of the ternary random copolymer, depolymerization occurs at high temperature to generate free radicals, and the alpha-vinyltoluene-styrene-maleic anhydride ternary random copolymer can be used as a macroinitiator to be applied to polyolefin grafting and polyolefin melt blending modification.