Synthesis and characterization of new series of ferroelectric liquid crystals containing oligooxyethylene spacers
作者:
Jr-Hong Chen,
Rong-Chi Chang,
Ging-Ho Hsiue,
Feng-Wei Guu,
Shung-Long Wu,
期刊:
Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 18,
issue 2
页码: 291-301
ISSN:0267-8292
年代: 1995
DOI:10.1080/02678299508036625
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Four series of ferroelectric liquid crystals containing oligooxyethylene spacers have been synthesized. These obtained liquid crystal compounds were characterized by NMR, differential scanning calorimetry (DSC) and optical polarized microscopy (POM). The properties of the liquid crystalline phase were investigated as a function of spacer units, numbers of core aromatic rings, and different terminal asymmetric moieties. It was found that (i) the phase transition temperature decreased with the increasing oligooxyethylene spacer unit, (ii) the liquid crystalline phases were enhanced in three phenyl ring system than in two phenyl ring system, and (iii) ferroelectric liquid crystals containing different terminal asymmetric moieties exhibited novel mesophase phenomena. A twist grain boundary phase (TGBAphase) was observed in some compounds of this study. Furthermore, a wide temperature chiral smectic Crange including room temperature was achieved.
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