在外场存在下液晶和棒状聚合物二元混合物的相图。

Phase diagrams of binary mixtures of liquid crystals and rodlike polymers in the presence of an external field.

机构信息

Department of Bioscience and Bioinformatics, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Kawazu 680-4, Iizuka, Fukuoka 820-8502, Japan.

出版信息

J Chem Phys. 2012 Jun 14;136(22):224904. doi: 10.1063/1.4728337.

DOI:10.1063/1.4728337

PMID:22713070

Abstract

We theoretically study phase separations in mixtures of a low molecular-weight-liquid crystalline molecule (LC) and a rigid-rodlike polymer (rod) under an external field, such as magnetic or electric fields. By taking into account two orientational order parameters of the rod and the LC, we define four nematic phases (N(0), N(1), N(2), N(3)) on the temperature-concentration plane. Depending on the sign of the dielectric anisotropy Δε(i) of the rod (i = 1) and LC(i = 2), we examine the phase behavior of rod/LC mixtures in the case of Δε(1) > 0, Δε(2) > 0 (a), Δε(1) < 0, Δε(2) > 0 (b), Δε(1) > 0, Δε(2) < 0 (c), and Δε(1) < 0, Δε(2) < 0 (d). We predict a variety of phase separations induced by an external field.

摘要

我们从理论上研究了在外场（如磁场或电场）作用下，低分子量液晶分子（LC）和刚性棒状聚合物（rod）混合物中的相分离。通过考虑棒和 LC 的两个取向序参量，我们在温度-浓度平面上定义了四个向列相（N(0)、N(1)、N(2)、N(3)）。根据棒（i=1）和 LC（i=2）的介电各向异性 Δε(i)的符号，我们检查了 Δε(1)>0，Δε(2)>0（a）、Δε(1)<0，Δε(2)>0（b）、Δε(1)>0，Δε(2)<0（c）和 Δε(1)<0，Δε(2)<0（d）情况下，rod/LC 混合物的相行为。我们预测了由外场引起的各种相分离。