SYNTHESIS OF RING-SHAPED POLYISOPRENE

被引：0

作者：

ELMADANI, A ^{[1
]}

FAVIER, JC ^{[1
]}

HEMERY, P ^{[1
]}

SIGWALT, P ^{[1
]}

机构：

[1] UNIV PARIS 06,CHIM MACROMOLEC LAB,URA 24,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE

来源：

POLYMER INTERNATIONAL | 1992年 / 27卷 / 04期

关键词：

ANIONIC POLYMERIZATION; ORGANODILITHIUM; CYCLIZATION; CYCLIC POLYISOPRENE;

D O I：

暂无

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Cyclization of alpha,omega-dilithiopolyisoprenes has been achieved in hexane solution in the presence of tetrahydrofuran (15% in volume) at -40 to -50-degrees-C. Using as linking agent the non-conjugated diene 1,2-bis(isopropenyl-4-phenyl)-ethane, macrocyclic polyisoprenes could be obtained with yields of at least 90%, even for molecular weights as high as 30 000 mol g-1. With SiCl4 as coupling agent no gelation occurred and yields of about 70% in cyclic dimers, probably bicyclic, have been observed. These results are compared to those obtained by various authors with alpha,omega-dilithiopolystyrenes or alpha,omega-disodiopolystyrenes and are attributed mainly to the presence, in the polyisoprene case, of predominant cyclic aggregates even at low organolithium concentration.

引用

页码：353 / 357

页数：5

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