Enantiotropic nematic phases of quaternary ammonium halide salts based on trioctadecylamine
作者:
N. Sharma,
G.A. Nagana Gowda,
C.L. Khetrapal,
R.G. Weiss,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 22,
issue 1
页码: 23-28
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997209630
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The neat phases of a series of quaternary ammonium halides based on trioctadecylamine have been investigated by optical microscopy, differential scanning calorimetry, and H NMR spectroscopy. Phase behaviour depends primarily on the structure of the fourth substituent on nitrogen and the thermal history of the samples. For instance, the iodide salts with methyl, ethyl, or propyl as the fourth substituent form enantiotropic nematic phases, while those with a proton or a longer alkyl substituent exhibit complex phase behaviour that does not include a liquid crystalline phase. Possible reasons are advanced for the unprecedented formation of nematic phases.
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