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S. A. Syrbu¹, O. Yu. Ditsyna¹, N. А. Shantin¹, М. R. Kiselev², S. А. Kuvshinova³

Author affiliations
¹Inorganic and Analytical Chemistry Department, Ivanovo State University,
Ermac str., 39, 153025 Ivanovo, Russia. 
E-mail: syrbue@yandex.ru
²Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninsky Ave, 31, 119991 Moscow, Russia
³Chemistry and Technology of High-molecular Compounds Department, Ivanovo State University of Chemistry and Technology,
Sheremetievsky Ave, 7, 153000 Ivanovo, Russia

Abstract
The p-n-propyloxycinnamic acid – p-n-propyloxy-p'-cyanobiphenyl system is researched by polarizing thermomicroscopy and differential scanning calorimetry. Two subphases are found in the region of nematic phase existence. The system?s volume properties are investigated by the polythermal dilatometry method. Analysis of temperature and concentration dependencies of volume properties was carried out. It is established that chained associates between p-n-propyloxycinnamic acid and p-n-propyloxy-p'-cyanobiphenyl form through hydrogen bonding.

Keywords: liquid crystals, mesomorphic properties, volume properties, polarizing thermomicroscopy, differential scanning calorimetry, polythermal dilatometry, phase diagram, nematic subphases, chained associates, hydrogen bond