MOLECULAR-DYNAMICS AND THE GLASS-TRANSITION IN A COLUMNAR LIQUID-CRYSTAL FORMED BY A CHIRAL DISCOTIC MESOGEN

被引：49

作者：

VALLERIEN, SU

WERTH, M

KREMER, F

SPIESS, HW

机构：

[1] Max-Planck-Institut fur Polymerforschung, Mainz, FR, D-6500

来源：

LIQUID CRYSTALS | 1990年 / 8卷 / 06期

关键词：

D O I：

10.1080/02678299008047400

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A new type of chiral discotic liquid crystal is described. It is based on a triphenylene core but carries only one asymmetric side chain per mesogen. This system displays a columnar liquid-crystalline mesophase with a helical superstructure and a pitch of 3·0 nm over a temperature range of 227 K. Upon cooling it forms a glassy state. By broadband dielectric and 2H NMR spectroscopy two motional processes are detected. The axial rotation of the discs around the column axis exhibits non-Arrhenius behaviour and is directly related to the glass transition. The second process is ascribed to localized side chain motions involving the ester linkages. © 1990 Taylor & Francis Group, LLC.

引用

页码：889 / 893

页数：5

共 18 条

[11] A PURE DISC-LIKE MOLECULE WITH CHOLESTERIC PROPERTIES [J].