Journal of Physical Chemistry p. 666 - 671 (1986)
Update date:2022-08-02
Topics:
Takenaka, Shunsuke
Koden, Mitsuhiro
Kusabayashi, Shigekazu
The effect of a central linkage X on the thermal stabilities of the cholesteric and smectic A phases of cholesteryl and β-sitosteryl esters of 4-aryl-X-benzoic and 4-aryl-X-cyclohexanecarboxylic acids (X=-COO-, -CH=N-, -N=N-, -CO-, etc.) has been examined.In both series, the cholesteric-isotropic and smectic A-cholesteric transition temperatures and the transition enthalpies are discussed in terms of the molecular structures and also the angular correlation parameter J22 of the carboxy functions.The transition enthalpies for the smectic A-cholesteric transition are also discussed in terms of the McMillan theory.
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