Influence of rare earth compounds on the anionic ring-opening polymerization of cyclosiloxanes

被引：4
|
作者：
Richard, G
Mingotaud, AF
Cardinaud, D
Soum, A
机构：
[1] ENSCPB,UMR 5629,LAB CHIM POLYMERES ORGAN,F-33402 TALENCE,FRANCE
[2] RHONE POULENC SILICONES,CRIT CARRIERES,F-69192 ST FONS,FRANCE
来源：
POLYMER BULLETIN | 1997年 / 39卷 / 05期
关键词：
Rare Earth; Molecular Weight Distribution; Anionic Polymerization; Cyclic Compound; Rare Earth Compound;
D O I：
10.1007/s002890050189
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 influence of rare earth compounds on the polymerization of cyclosiloxanes has been studied for hexamethylcyclotrisiloxane (D-3) and octamethylcyclotetrasiloxane (D-4). In both cases, it has been shown that rare earth compounds alone do not lead to well defined polymers : yields are never quantitative and the formation of cyclic side-products is always observed. The influence of these compounds has also been studied in the anionic polymerization of the same cyclosiloxanes initiated by organolithium reagents or fluorides. In the case of D-3, it has been shown that back-biting reactions can be slowed down in the presence of rare earth compounds whereas for D-4, both polymerization and back-biting reactions get slower.
引用
收藏
页码：581 / 588
页数：8
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