Crystalline ethylene-styrene monomer random copolymer and preparation method thereof

The invention discloses a crystalline ethylene-styrene monomer random copolymer and a preparation method thereof, and belongs to the technical field of olefin polymer preparation. According to the invention, a bridged bismetallocene rare earth compound is combined with a cocatalyst organic boron salt and a main group alkyl reagent to serve as a catalytic system to catalyze random copolymerization of ethylene and styrene monomers; the bridged bismetallocene rare earth compound which has low catalytic activity or no catalytic activity on copolymerization of ethylene and styrene monomers shows high catalytic activity on copolymerization of ethylene and styrene monomers, and has preferential selectivity on ethylene polymerization; the crystalline ethylene-styrene monomer random copolymer containing the polyethylene chain segment is prepared, and the copolymer is low in styrene content and specifically contains 2.0 mol%-20.0 mol% of styrene. 本发明公开了一种结晶性乙烯-苯乙烯类单体无规共聚物及其制备方法，属于烯烃聚合物制备技术领域。本发明使用桥联双茂稀土化合物与助催化剂有机硼盐和主族烷