Director orientation of nematic side-chain liquid crystalline polymers under shear flow: Comparison of a flow-aligning and a non-flow-aligning polysiloxane

被引：10
|
作者：
Siebert, Hartmut
Ouijada-Garrido, Isabel
Vermant, Jan
Noirez, Laurence
Burghardt, Wesley R.
Schmidt, Claudia
机构：
[1] Univ Freiburg, Inst Makromol Chem, D-79104 Freiburg, Germany
[2] CSIC, Inst Ciencia & Tecnol Polimeros, E-28006 Madrid, Spain
[3] Katholieke Univ Leuven, Dept Chem Engn, B-3001 Louvain, Belgium
[4] CE Saclay, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France
[5] Northwestern Univ, Dept Chem & Biol Engn, Evanston, IL 60208 USA
来源：
MACROMOLECULAR CHEMISTRY AND PHYSICS | 2007年 / 208卷 / 19-20期
关键词：
D O I：
10.1002/macp.200700248
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 flow behavior and phase structure of two side-chain liquid-crystalline polysiloxanes with the same mesogens but different spacers of either four (PSi4) or six (PSi6) methylene groups are studied in the nematic phase by H-2 NMR, polarization microscopy, and scattering of light, neutrons, and X-rays. PSi4 is flow-algning, forming a monodomain with the director close to the flow direction, whereas PSi6 is non-flow-aligning showing a polydomain structure with a preferred director orientation corresponding to the log-rolling state. The flow behavior of PSi6 is related to the presence of strong smectic clusters. The director tilt in the smectic clusters of both polymers is reported.
引用
收藏
页码：2161 / 2172
页数：12
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