关键词: 串联催化剂体系, 催化剂, 茂金属, 乙烯齐聚, 聚合, 线性低密度聚乙烯, 反应动力学

Abstract: Preparation of linear low density polyethylene (LLDPE) by tandem action of an oligomerization catalyst and a copolymerization catalyst is one of the most popular areas in polyolefin catalyst research. Advance in the tandem catalysis system is reviewed. Five kinds of tandem catalysis systems are discussed，namely，low selectivity system，high selectivity system，long branched system，supported metallocene catalyst system，and dual functional system considering the selectivity of oligomerization catalyst and difference in the copolymerization catalysts used. The selectivity of oligomerization catalysts and compatibility of copolymerization catalysts with different abilities played an important role in the polymerization with respect to polymer structure and properties under various reaction conditions. The features of different systems are also discussed.

Key words: tandem catalysis system, catalyst, metallocene, ethylene oligomerization, polymerization, linear low density polyethylene, reaction kinetics