Phase transitions and conformational changes in an antiferroelectric liquid crystal 4-(1-methylheptyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate (MHPOBC)
作者:
KyeongHyeon Kim,
Yoichi Takanishi,
Ken Ishikawa,
Hideo Takezoe,
Atsuo Fukuda,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 2
页码: 185-202
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408029146
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The thermodynamic properties and conformational structures in the crystalline and liquid crystalline phases of 4-(1-methylheptyloxycarbonyl)phenyl 4′-octyloxybiphenyl-4-carboxylate (MHPOBC) have been investigated by Raman scattering, X-ray diffraction and differential scanning calorimetry (DSC). MHPOBC can assume two different crystalline states at room temperature depending on crystallization conditions, and heating transforms the metastable crystal to the stable one before melting. In the liquid crystalline phases, Raman scattering spectra have revealed not only the flip-flop twisting vibration of the biphenyl group but also the internal rotation around C-C bonds between the carbonyl groups and the corresponding benzene rings.
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