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化学进展  2010 

乙烯和降冰片烯加成共聚合催化体系*

, PP. 2024-2032

Keywords: 加成共聚,降冰片烯,乙烯,茂金属催化剂,非茂金属催化剂,后过渡金属催化剂

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Abstract:

在C5系列的综合利用中近年来倍受关注的环烯烃共聚物是最具有发展潜力的高端产品之一。本文评述了用于乙烯和降冰片烯类共聚合体系新型加成催化剂的最新进展,包括茂金属催化剂、非茂金属催化剂和后过渡金属催化剂三大类。开发新型半夹心型催化剂是茂金属研究领域的热点,目前主要有两类1.限定几何构型催化剂(CGC);2.Cp’MX3和Cp’M(R)X2(Cp’=茂基或取代茂基;M=Ti,Zr,Hf;X=卤素或烷基;R=OAr,NR2,NPR3)。非茂金属催化剂则具有亲电能力更强的活性中心及更开放的配位空间,通常具有更高的NB插入率,甚至在一定条件下具有类活性聚合的特征。而后过渡金属催化剂由于对氧(或Lewis酸)更不敏感,导致对极性基团有更好的耐受性。此外,重点围绕配体结构对催化特性的影响,如何提高分子量和环烯烃的有效插入率及其序列结构的调控等进行了对比和剖析,并展望其今后发展趋势。

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