STEREOSPECIFIC LIVING POLYMERIZATION OF TERT-BUTYLACETYLENE BY MOLYBDENUM-BASED TERNARY CATALYST SYSTEMS

被引：33

作者：

NAKANO, M ^{[1
]}

MASUDA, T ^{[1
]}

HIGASHIMURA, T ^{[1
]}

机构：

[1] KYOTO UNIV,DEPT POLYMER CHEM,KYOTO 60601,JAPAN

来源：

MACROMOLECULES | 1994年 / 27卷 / 06期

关键词：

D O I：

10.1021/ma00084a011

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The polymerization of tert-butylacetylene (tBA) by the MoOCl4-n-Bu4Sn-EtOH (1:1:1) catalyst led to living and stereoregular polymers with narrow molecular weight distributions (M(w)BAR/M(n)BAR = 1.12; cis 97%). The living nature of this polymerization was confirmed by the fact that, in toluene at 0 and -30-degrees-C, the M(n)BAR of the polymer increases in direct proportion to monomer consumption, while the molecular weight distribution remains narrow. The cis content of the polymer was evaluated by C-13 NMR spectroscopy. Similar but somewhat inferior results were obtained with the MoCl5-n-BU4Sn-EtOH (1:1:1) system (M(w)BAR/M(n)BAR = 1.24; cis 90%). Besides the narrow molecular weight distribution and high cis specificity, the features of these polymerizations include large reaction rates (e.g., completed within 1 min at 0-degrees-C) and rather low initiator efficiencies ([P*]/[Cat] approximately 2%).

引用

页码：1344 / 1348

页数：5

共 24 条

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