SYNTHESIS AND PROPERTIES OF POLY[BIS(GAMMA-ETHOXYPROPYL)SILYLENE]

被引:22
作者
FREY, H
OUT, GJJ
MOLLER, M
GRESZTA, D
MATYJASZEWSKI, K
机构
[1] UNIV TWENTE,POSTBUS 217,7500 AE ENSCHEDE,NETHERLANDS
[2] INST CHARLES SADRON,F-67000 STRASBOURG,FRANCE
关键词
D O I
10.1021/ma00075a017
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Bis(gamma-ethoxypropyl)dichlorosilane was synthesized by hydrosilylation of dichlorosilane. Polymerization yielded monomodal high molecular weight poly[bis(gamma-ethoxypropyl)silylene] (PDEPS). PDEPS is soluble in alcohols with longer alkyl groups and acetone. Bulk PDEPS exhibits a blue shift of lambda(max) from 362 to 315 nm correlated with the mesomorphic transition occurring at 25-degrees-C. Above 25-degrees-C, PDEPS transforms into a highly mobile columnarlike mesophase. Transition enthalpy, wavelength of the absorption maximum, and Si-29 MAS CP solid-state NMR indicate that PDEPS crystallizes in a disturbed all-trans-like structure. In addition to PDEPS, some copolymers with di-n-hexyl-substituted units were studied.
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页码:6231 / 6236
页数:6
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