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学科主题: 金属有机化学
题名: 新一代高活性后过渡金属烯烃聚合催化剂
其他题名: Novel highly active late transition metal catalysts for olefin polymerization
作者: 陈瑞芳 ; 钱长涛 ; 李杨 ; 邹丰楼
通讯作者: 钱长涛
刊名: 有机化学
发表日期: 2000-01-01
卷: 20, 期:5, 页:712-718
收录类别: SCI
部门归属: 中国科学院上海有机化学研究所; 北京燕山集团有限化工公司研究院
摘要: 介绍了近几年发展起来的新一代后期过渡金属(Fe,CoNi,Pd)烯烃聚合催化剂, 对催化剂的结构、性能及催化烯烃聚合机理进行了阐述。
英文摘要: The nicke(II) and palladium(II) systems coordinated by bulky diimine ligands are the first examples of late transition metal catalysts capable of polymerizing higherα-olefins as well as ethylene to high molecular weight polymers. The nicke (II)/MAO system can polymerize ethylene to produce a range of polyethylene materials with moecular weight up to 1×10^6 and degrees of branching from linear to over 70 branches per 1000 carbon atoms by simple variation of temperature, pressure, and ligand structures. The analogous palladium (II) complexes show moderate activity to produce very highly brached amorphous polyethylene. Furthermore, the palladium (II) catalysts are able to copolymerize α-olefins with functionalized monomers, inclucing sulfonyl halide and carbonyl, resulting in highly branched random copolymers. In addition, A new family of complexes based on a five-coordinate iron or cobalt center supported by neutral tridentate 2,6-bis (imino).pyridyl ligands and, when activated with MAO, shows exceptional high activity for ethylene polymerization. Activity figures in many cases are comparble or even higher than those found for Group 4 metalloceneunder analogous conditions. The molecular weight of the polyethylene material generated shows a marked dependency upon the aryl substitution pattern. Therefore, this review mainly covers families of late transition metal catalysts based largely on chelating nitrogenbased ligands that are active for homopolymerization of ethylene and the copolymerization of ethylene with α-olefins and polar monomers. Catalysts syntheses, structures, activities, and chain-gowth mechnisms and the influence of these factors on the structures of the resulting polymers are also discussed.
语种: 中文
内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/15217
Appears in Collections:金属有机化学国家重点实验室_期刊论文

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Recommended Citation:
陈瑞芳,钱长涛,李杨,等. 新一代高活性后过渡金属烯烃聚合催化剂[J]. 有机化学,2000,20(5):712-718.
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