单茂金属烯烃聚合催化剂*

本文综述了近年来带有给电子配体的单茂金属化合物应用于烯烃聚合的研究。带有给电子配体的单茂金属化合物是目前烯烃配位聚合催化剂的研究热点之一。作为新型的聚合催化剂，这类催化剂具有合成简单、结构清晰的特点，用于催化烯烃聚合，可得到高聚合活性，同时聚合物可得到高的分子量。用于共聚时，具有很好的共聚能力。通过共聚，可以得到Zieler-Natta催化剂和传统茂金属催化剂不能得到的新共聚物。通过调整催化剂上茂配体和给电子配体的结构，可以方便地调节聚合行为，从而调整聚合物的结构。文中涉及了乙烯、alpha-烯烃的均聚与共聚，乙烯与环烯烃共聚合，苯乙烯聚合等方面的研究。

Olefin Polymerization with Half-Metallocene Catalyst Systems

The present article reviews the recent progress of half-metallocene with donor ligand(s) as catalyst for olefin polymerization. Half-metallocene with donor ligand(s) is an important type of catalyst for olefin polymerization, and attracts more and more attentions. As a novel type of polymerization catalyst, the complex with clear structure could be synthesized in simple procedure. Using as catalyst for olefin polymerization, high activity is available, and affording polymer with high molecular weight. For olefin copolymerization, excellent copolymerization ability could be observed, and some of obtain copolymers could not be produced by Ziegler-Natta catalyst and traditional metallocene catalyst systems. Polymerization behavior and polymer structure could be adjusted through balancing the structure of cyclopentadienyl ligand and donor ligand. The homo- and co-polymerization of ethylene and alpha-olefin, copolymerization of ethylene and cyclic olefin, and styrene polymerization are involved. Contents
1 Half-metallocene ligated with aryloxy (alkyloxy) group
1.1 Ethylene polymerization
1.2 Copolymerization of ethylene with a-olefin
1.3 Copolymerization of ethylene with cyclic olefin
1.4 Styrene (co)polymerization
2 Half-metallocene ligated with nitrogen atom
3 Bridged half-metallocene