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Kseniya B. Gurevich, Sergei M. Pestov*

Author affiliations
Russian Technological University (RTU MIREA), M. V. Lomonosov Institute of Fine Chemical Technologies, Department of physical chemistry, Moscow, Russia
*Corresponding author: pestovsm@yandex.ru

Abstract
Solubility polytherms of nematic (smectic-nematic) N(p-n-alkyloxybenzyliden)-p’-toluidenes (n-alkyl = C₄H₉, C₉H₁₉, C₁₀H₂₁) in organic solvents have been studied. Thermal analysis, visual-polythermal and solubility methods were used. The solution enthalpies of these mesogens in 8 solvents (n-hexane, n-heptane, benzene, p-xylene, cyclohexane, methylcyclohexane, ethanol, n-propanol) were determined. To calculate the solubility polytherms, thermodynamic methods based on the Hildebrand solubility parameters were used. The advantage of the proposed calculation method is that it requires a minimum of experimental parameters (fusion enthalpy and melting temperature of pure mesogen) and the data obtained from the structural formula (group contribution increments) of a mesogen to evaluate its solubility polytherms.

Keywords: liquid crystals, N(p-n-alkyloxybenzyliden)-p’-toluidenes, solubility curves, Hildebrand solubility parameters