| 共轭二烯烃的Ziegler─Natta催化聚合 |
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| 引用本文： | 曹孟骏,吕培芝,于旻. 共轭二烯烃的Ziegler─Natta催化聚合[J]. 高分子通报, 1994, 0(1) |
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| 作者姓名： | 曹孟骏 吕培芝 于旻 |
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| 作者单位： | 中国科学院成都有机化学研究所，中国科学院长春应用化学研究所 |
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| 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~（２＋）、Ｔｉ~（３＋）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~（３＋）、Ｃｒ~（３＋）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。
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| 关 键 词： | 配位聚合，Ziegler－Natta催化剂，丁二烯－1，3 |
Polymerization of Conjugated Dtenes by Ziegler-Natta Catalysts |
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| Cao Mengjun, Lu Peizhi. Polymerization of Conjugated Dtenes by Ziegler-Natta Catalysts[J]. Polymer Bulletin, 1994, 0(1) |
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| Authors: | Cao Mengjun Lu Peizhi |
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| 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 alkyl 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),cis1, 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. |
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| Keywords: | Coordination polymerization Ziegler-Natta catalysts Butadiene |
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