ⅣB金属配合物催化烯烃聚合与共聚

袁世芳, 牛春霞, 魏学红, 孙文华

doi:10.7536/PC160403

化学进展 ›› 2016, Vol. 28 ›› Issue (7) :1070-1075 DOI: 10.7536/PC160403

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ⅣB金属配合物催化烯烃聚合与共聚

袁世芳, 牛春霞, 魏学红, 孙文华

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ⅣB-Metal Complex Catalysts toward Olefin Polymerization and Copolymerization

Yuan Shifang, Niu Chunxia, Wei Xuehong, Sun Wenhua

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摘要

在大品种聚烯烃材料中，高附加值聚烯烃通常由乙烯与α-烯烃共聚制备。ⅣB金属配合物能够为烯烃聚合和共聚提供许多催化剂模型；不仅如此，在烯烃聚合机理研究中还可以帮助理解反应中间体和活性物种。针对聚烯烃产业的实用催化剂体系，催化剂不仅满足高的催化活性，而且能够满足升温操作的稳定性。企业的利润需要高附加值聚烯烃，要求催化剂体系能够通过条件变化制得不同性能的聚烯烃材料，而且可以实现乙烯与α-烯烃的共聚。这些对配合物催化剂的需求，在ⅣB金属配合物催化剂中获得了良好地体现；能够在烯烃聚合中获得分子量从低到高的聚合物，也可以进行乙烯与（甚至含有官能团的）α-烯烃共聚制备功能聚烯烃。按照取代基团的分类，本文综述了近年来ⅣB金属配合物催化烯烃聚合与共聚研究的新进展，特别是重点讨论了具有良好热稳定性的配合物催化剂结构变化对于催化活性和聚合性能的影响。

Abstract

Within large-volume polyolefin materials, the value-adding polyolefins have been commonly produced through the copolymerization of ethylene with α-olefin. The Ⅳ B metal complexes have provided various models of precatalysts toward α-olefin polymerization and copolymerization. Meanwhile those metal complexes have also been used as the intermediates or active species in order to understand the mechanism of olefin copolymerization. Targeting a practicing catalytic system for polyolefin industry, the Ⅳ B metal complexes would meet the demands of highly active catalysis, moreover, the catalytic systems should be remained enough stable at the elevated temperature. To have value-adding materials for higher profits, the catalytic system could be adaptable for polyolefins with various properties through being operated under different parameters; such features have been fitted well to Ⅳ B metal precatalysts, which achieve to produce polyolefins with the molecular weights in the useful range from medium to ultrahigh due to different polymerization conditions as well as functionalized polyolefins through the copolymerization of ethylene with α-olefin containing functional groups. Recent progress of Ⅳ B metal complexes for olefin polymerization and copolymerization has been reviewed herein, focusing on different metal complexes being classified due to groups of their ligands used. Moreover, the correlation between structures of metal complexes and their catalytic activity have been considered along with reaction temperatures.

Contents
1 Introduction
2 Constrained geometry catalysts
3 Imino-amido type catalysts
3.1 Pyridyl-amide catalysts
3.2 Imino-amido catalysts
3.3 Imino-enamido catalysts
3.4 Amidoquinoline catalysts
4 Bridging nitrogenous heterocyclic catalysts
5 Conclusion

Graphical abstract

关键词

ⅣB金属 / 配合物 / 催化剂 / 烯烃聚合 / 共聚

Key words

ⅣB metal / complex / catalyst / olefin polymerization / copolymerization

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袁世芳, 牛春霞, 魏学红, 孙文华. ⅣB金属配合物催化烯烃聚合与共聚[J]. 化学进展, 2016, 28(7): 1070-1075 DOI:10.7536/PC160403

Yuan Shifang, Niu Chunxia, Wei Xuehong, Sun Wenhua. ⅣB-Metal Complex Catalysts toward Olefin Polymerization and Copolymerization[J]. Progress in Chemistry, 2016, 28(7): 1070-1075 DOI:10.7536/PC160403

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