Effect of molecular structure on the phase behaviour of some liquid crystalline compounds and their binary mixtures. I. 4-Hexadecyloxyphenyl-4-carboxybenzoate and 4-carboxyphenyl-4-hexadecyloxybenzoate
作者:
MAGDIM. NAOUM,
G. HOHNE,
H. SELIGER,
E. HAPP,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 5
页码: 653-658
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997207920
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
4-Hexadecyloxyphenyl-4-carboxybenzoate (A) and 4-carboxyphenyl-4-hexadecyloxy benz- oate (B) were prepared and thermally characterized by polarized light microscopy and differential scanning calorimetry. Both compounds possess high transition temperatures indicating the formation of linear dimer molecules in the solid and liquid phases. The infrared data support the conclusion that the alkoxyphenyl carbonyl unit in A is more polarizable and hence stabilizes the intermolecular packing, thus leading to enhanced mesogenicity. Mixtures of the two compounds were prepared and thermally characterized to construct the phase diagram that showed a simple eutectic behaviour in the solid-mesophase transitions, and a linear mesophase-isotropic transition temperatures. The latter behaviour was attributed to similar electronic factors in both molecules.
点击下载:
PDF (167KB)
返 回