中文摘要：

本文综述了近年来以不同催化体系合成具有不同支化拓扑结构聚烯烃的研究进展。传统的方法主要是通过乙烯自由基聚合和前过渡金属催化剂催化乙烯与α-烯烃共聚来合成支化聚乙烯。其中,原位共聚法可合成具有不同支化度、不同支链长度的支化聚乙烯。新发展起来的后过渡金属催化剂,不仅可以催化单一乙烯合成出支化、超支化,甚至是树枝状等一系列不同拓扑结构的聚乙烯,而且可以催化乙烯与极性单体共聚得到末端功能化聚乙烯。

英文摘要：

Advances on the catalysts and technologies of preparing branched polyolefins with controllable topology structures are reviewed. Traditionally, branched polyethylenes are obtained by radical polymerization of ethylene, as well as coordination copolymerization of ethylene with a-olefin catalyzed by early transition metal compounds. By combining ethylene oligomerization with in situ copolymerization of ethylene and the produced a-olefin oligomers, branched polyethylenes with different branch lengh and branching degree are also prepared. In recent years, the newly-developed late transition metal catalysts can be used to synthesize not only the branched, hyperbranched and dendritic polyethylenes by ethylene homopolymeruzation, but also the end-functional polyolefins with controllable topologies by copolymerization of ethylene with polar monomer.