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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
E-mail: pestovsm@yandex.ru

Abstract
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