侧链液晶凝胶的体积相变理论。

Theory of volume phase transitions of side-chain liquid crystalline gels.

作者信息

Matsuyama Akihiko

机构信息

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

出版信息

J Chem Phys. 2007 Aug 28;127(8):084906. doi: 10.1063/1.2772593.

DOI:10.1063/1.2772593

PMID:17764293

Abstract

We present a mean field theory to describe volume phase transitions of side-chain liquid crystalline gels. Three different uniaxial nematic phases (N(1), N(2), and N(3)) are defined by using orientational order parameter S(m) of side-chain liquid crystals (mesogens) and S(b) of backbone chains. We derive the free energy for the three nematic phases of side-chain liquid crystalline gels dissolved in isotropic solvents and calculate the swelling curve of the gel, the order parameters of a backbone chain and of side-chain liquid crystals, and the deformation of the gel as a function of temperature and an electric field. We find isotropic-nematic (N(1), N(2), and N(3)) and N(1)N(2) phase transitions of the gels, depending on the interaction between a backbone chain and a side-chain liquid crystal.

摘要

我们提出一种平均场理论来描述侧链液晶凝胶的体积相变。通过使用侧链液晶（介晶）的取向序参数(S_m)和主链的(S_b)定义了三种不同的单轴向列相（(N(1))、(N(2))和(N(3))）。我们推导了溶解在各向同性溶剂中的侧链液晶凝胶的三个向列相的自由能，并计算了凝胶的溶胀曲线、主链和侧链液晶的序参数以及凝胶随温度和电场的变形。我们发现凝胶存在各向同性 - 向列相（(N(1))、(N(2))和(N(3))）以及(N(1)N(2))相变，这取决于主链与侧链液晶之间的相互作用。