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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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Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2013, 2, 95—103.

Study of Phase Transitions in p-n-Heptyloxybenzoic Acid – p-n-Undecyloxybenzoic Acid Systems

S. A. Syrbu1,2,  Z. A. Kudryashova3,4,  L. A. Nosikova3,4,  E. I. Efremova3, M. R. Kiselev4

Author affiliations
1Ivanovo State University, Inorganic and Analytical Chemistry Dept.,
Russia, 153025, Ivanovo, Ermak street, 39.
2Ivanovo Institute of the State Fire Service
Stroitelei pr. 33, Ivanovo, 153040 Russia. 
3Lomonosov Moscow State University of Fine Chemical Technologies
119571 Moscow, Russia, prospect Vernadskogo 86
4A.N. Frumkin Institute of Physical chemistry and Electrochemistry RAS
31, Leninsky prospect, Moscow, 199071 Russia

The p-n-heptyloxybenzoic acid(I) – p-n-undecyloxybenzoic acid (II) system studied by polarizing optical microscopy, differential scanning calorimetry and dilatometric methods. Coordinates of the invariant equilibrium were obtained. Temperature and concentration dependencies of volume properties were analyzed. It was found that in the system there are two nematic and two smectic subphases. For the composition with the ratio of components 2(I): 1(II) the density and its derivatives values are extremal, indicating the formation of acid associates in the system.

Keywords: liquid crystals, p-n-alkyloxybenzoic acids, polarizing optical microscopy, differential scanning calorimetry, polythermal dilatometry, nematic subphases, associates, density, molecular packing coefficient, excessive molar volume.

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