Anomalous Concentration Effects on Phase Behavior and Nematic Order in Mixtures of Side-Chain Liquid Crystal Polymers and Low-Molecular-Weight Liquid Crystals

被引：6

作者：

Zhuang, Bilin ^{[1
]}

Wang, Zhen-Gang ^{[1
]}

机构：

[1] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA

来源：

MACROMOLECULES | 2012年 / 45卷 / 15期

基金：

美国国家科学基金会;

关键词：

MOLEKULAR-STATISTISCHE THEORIE; MAIN-CHAIN; ELECTRORHEOLOGICAL BEHAVIOR; BACKBONE CONFORMATION; SMECTIC PHASE; FIELD THEORY; POLYSILOXANES; SCATTERING; ANISOTROPY; DIAGRAMS;

D O I：

10.1021/ma300657s

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

We study the anomalous concentration effects in mixtures of side-chain liquid crystalline polymers (SCLCPs) and low-molecular-weight liquid crystals (LMWLCs) by modifying the theory of Brochard, Jouffroy, and Levinson (BJL) to include the effects of the polymer backbone. Our new theory considers both the interaction of the polymer backbone with the global nematic field, as well as the local steric constraints due to the grafting of the side groups onto the polymer backbone. In addition, we consider the enhancement in the coupling between the pedant mesogens and the LMWLC molecules as the SCLCP concentration increases. The resulting phase diagram and nematic order parameters are in qualitative agreement with experimental observations, but drastically different from the predictions by the BJL theory.

引用

页码：6220 / 6229

页数：10

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