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Liquid Crystals and their Application
Russian Journal

Zhidkie kristally i ikh prakticheskoe ispol'zovanie

Жидкие кристаллы и их практическое использование

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Rus Eng


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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2018, 18 (1), 30—36.
DOI: 10.18083/LCAppl.2018.1.30

Thermodynamic Modelling of Systems Containing Liquid Crystalline Phenylbenzoates

S. M. Pestov, S. Yaghoubpour

Author affiliations
Moscow Technological University, Department of physical chemistry, Institute of fine chemical technologies,
86 Vernadskogo pr., Moscow, 119571, Russia

Systems of nematic (smectic-nematic) liquid crystalline p-butyloxyphenyl p'-n-alkyloxybenzoates (n-alkyl = hexyl, heptyl, nonyl, decyl) with solvents of different classes were studied. The systems were investigated by thermal analysis, polarizing microscopy, visual-polythermal analysis and solubility methods. Temperatures of monotectics and solubility curves of liquid crystals in solvents were obtained. Thermodynamic methods based on the Hildebrand and Hansen solubility parameters were used to predict the phase diagram type. A group-contribution scheme was used to calculate solubility parameters of the liquid crystals. A simple scheme of solvent selection for purification of mesogens was proposed.

Keywords: liquid crystals, phenylbenzoates, solubility, solubility parameter, Hansen solubility parameter

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