Molecular dynamics and the glass transition in a columnar liquid crystal formed by a chiral discotic mesogen
作者:
S.U. Vallerien,
M. Werth,
F. Kremer,
H.W. Spiess,
期刊:
Liquid Crystals
(Taylor Available online 1990)
卷期:
Volume 8,
issue 6
页码: 889-893
ISSN:0267-8292
年代: 1990
DOI:10.1080/02678299008047400
出版商: Taylor & Francis Group
数据来源: Taylor
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 and2H 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.
点击下载:
PDF (264KB)
返 回