LITHIUM ALKYL INITIATED POLYMERIZATION OF ISOPRENE - EFFECT OF CIS-TRANS ISOMERIZATION OF ORGANOLITHIUM COMPOUNDS ON POLYMER MICROSTRUCTURE

被引：61

作者：

WORSFOLD, DJ ^{[1
]}

BYWATER, S ^{[1
]}

机构：

[1] NATL RES COUNCIL CANADA,DIV CHEM,OTTAWA K1A 0R9,ONTARIO,CANADA

来源：

MACROMOLECULES | 1978年 / 11卷 / 03期

关键词：

D O I：

10.1021/ma60063a030

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 microstructure of polyisoprene produced by sec-butyllithium initiation in a hydrocarbon solvent has been investigated as a function of initial monomer and initiator concentrations. The trans-1, 4 content was found to increase as the initiator concentration increased and as the monomer concentration decreased. It is suggested that the trans content increases because cis-active centers produced by monomer addition can isomerize to trans-centers when monomer addition is slow. To check this hypothesis the isomerization rates of model compounds of DP=1 and 2 have been measured. It is found that such a mechanism in conjunction with a higher rate of addition of monomer to cis-centers can account for the observed changes in microstructure. © 1978, American Chemical Society. All rights reserved.

引用

页码：582 / 586

页数：5

共 16 条

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