Orthogonal hexatic smectic phase-rare or common?
作者:
Wiesdłsaw Pyzuk,
Adam Krówczyński,
Jadwiga Szydłsowska,
Ewa Górecka,
期刊:
Liquid Crystals
(Taylor Available online 1995)
卷期:
Volume 19,
issue 1
页码: 85-91
ISSN:0267-8292
年代: 1995
DOI:10.1080/02678299508036723
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The hexatic smectic B (Hex B) phase is commonly encountered among hydrogen-bonded liquid crystal materials. Among enaminoketone and Schiff's base compounds, twenty homologous series(c.102compounds) exhibiting orthogonal mono-or bi-layer hexatic phases were identified by combined microscopy and DSC. Phase transitions from crystal B (CrB) of Sfto Hex B as well as from Hex B to Sf, Saor Scphases were observed within the range 50 to 190°C. Temperature ranges of the Hex B phase detectable by DSC varied from 0.2 to 20°C. Within two groups of three-ring enaminoketones, the formation of the Hex B phase was found to be controlled by both inductive and mesomeric components of the Hammett constants of the terminal substituents of the molecules.
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