Photoinitiated cationic ring-opening polymerization of a cyclosiloxane

被引：8
|
作者：
Belfield, KD
Zhang, GY
机构：
[1] Department of Chemistry, University of Detroit Mercy, P.O. Box 19900, Detroit
来源：
POLYMER BULLETIN | 1997年 / 38卷 / 02期
关键词：
Photopolymerization; Dimethylsiloxane; SbF6; Cationic Polymerization; Iodonium;
D O I：
10.1007/s002890050033
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Hexamethylcyclotrisiloxane was found to undergo photoinitiated cationic ring-opening polymerization in solution and bulk, upon exposure to UV radiation, in the presence of either sulfonium or iodonium salts or an iminosulfonate derivative. Glass transition temperatures were below -100 degrees C. Molecular weights, determined by size exclusion chromatography relative to polystyrene standards, increased with photolysis lamp intensity. Use of an iodonium photoinitiator afforded poly(dimethylsiloxane) with Mn = 172,000. Polymerization of hexamethylcyclotrisiloxane was accompanied by a small increase in volume (3-4%).
引用
收藏
页码：165 / 168
页数：4
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