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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 (2), 95—102.
DOI: 10.18083/LCAppl.2018.2.95

Application of the Hansen Solubility Parameter for Modelling of Liquid Crystal – Solvent Systems

S. M. Pestov, S. Yaghoubpour

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

Systems of nematic (smectic-nematic) liquid crystalline p-butyloxyphenyl p'-n-alkyloxybenzoates (n-alkyl = hexyl, heptyl, nonyl, decyl) and p-n-alkyloxybenzyliden-p'-toluidenes (n-alkyl = butyl, hexyl, nonyl) with solvents of different classes were studied. Systems were investigated by thermal analysis, polarizing microscopy, visual-polythermal and solubility methods. Solubilities of liquid crystals in solvents at 298 K were obtained. Thermodynamic methods based on the Hansen solubility parameters were used to predict the phase diagram type. Group-contribution scheme to calculate the Hansen solubility parameters of liquid crystals was used. Express-schemes (Teas triangle, distance) for selection of solvent to purify mesogens were proposed.

Keywords: liquid crystals, phenylbenzoates, alkyloxybenzyliden-toluidenes, phase diagrams, solubility, the Hansen solubility parameter, distance, Teas triangle

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