Controlled polymerization of olefin and its macromolecular engineering

Abstract

Polyolefin materials, such as polyethylene, polypropylene, polyisobutene, ethylene-propylene rubber and isobutene rubber, play important roles in the industry and our daily life. Polyolefin materials with high performance, various microstructure, sequence distribution and topological structure could be prepared by controlled polymerization of olefin. We summarized the recent work on ethylene/propylene coordination copolymerization and isobutene cationic polymerization to prepare ethylene-propylene rubber, isobutene rubber and polyisobutene. The design and synthesis of Ziegler-Natta vanadium catalysts, half-titanocene catalysts and single-site vanadium catalyst and their application for ethylene/propylene copolymerization were introduced. The novel initiating system for the controlled/living cationic polymerizations, transformation of polymerization character, cationic polymerization in aqueous medium with high efficiency, cationic polymerization in rotating packed bed reactor were developed. The macromolecular engineering based on the controlled polymerization of olefin was also introduced.