Polymerization of Conjugated Dtenes by Ziegler - Natta Catalysts

Mengjun Cao; Peizhi Lu; Min Yu

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Polymerization of Conjugated Dtenes by Ziegler - Natta Catalysts

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- Polymerization of Conjugated Dtenes by Ziegler - Natta Catalysts
- Polymer Bulletin Vol. 7, Issue 1, Pages: 52-58(1994)
- 作者机构：
  
  1.中国科学院成都有机化学研究所，成都，610041
  2.中国科学院长春应用化学研究所，长春，130022
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：1994-03，
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Mengjun Cao, Peizhi Lu, Min Yu. Polymerization of Conjugated Dtenes by Ziegler - Natta Catalysts. [J]. Polymer Bulletin 7(1):52-58(1994)
DOI：

Mengjun Cao, Peizhi Lu, Min Yu. Polymerization of Conjugated Dtenes by Ziegler - Natta Catalysts. [J]. Polymer Bulletin 7(1):52-58(1994) DOI：

摘要

共轭二烯烃的聚合是配位阴离子聚合，双金属配合物是聚合的活性中心，控制单体的构象是控制聚合物结构的关键。单体在低值配位场稳定化能(LFSE)过渡金属离子，如Co

、Ti

上螯合，螯合单体具有顺式构象，所得聚合物具有顺1，4结构；在中等LFSE的过渡金属离子，如V

、Cr

上配位，配位单体具有反式构象，所得聚合物具有反1，4结构或是1，2聚合物；高LFSE值过渡金属离子不易控制活性价态，双金属配合物不够稳定，所得聚合物分子量常较低，结构规整性也常不够理想。

Abstract

The polymerization of conjugated dienes by Ziegler - Natta catalysts is studied. It is believed that the active centers of the catalysts are the bimetallic complexes composed of transition metal and organo - aluminum compounds

through lonic chlorine and alkyl or allyl chain endings Controlling the conformation of monomer inserting to the chain ending is of great importance: by chelation of both the double bonds of the monomer with cisoid of conformation on transition metal ions of low ligand field stabilization energy (LFSE)

cisl

4 polymers are obtained

and by coordination of only one double bond with transoid conformation

on transition metal irons of higher LFSE

trans 1

4 or 1

2 polymers will be prepared

关键词

配位聚合Ziegler-Natta催化剂丁二烯-13

Keywords

Coordination polymerizationZiegler -Natta catalystsButadiene

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