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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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We are pleased to inform that the journal Liquid Crystals and their Application is included in Web of Science (Emerging Sources Citation Index) and Scopus (Q3) databases.

Journal



Zhidk. krist. ikh prakt. ispol'z. = Liq. Cryst. and their Appl., 2019, 19 (1), 70—78.
DOI: 10.18083/LCAppl.2019.1.70





Dielectric Properties of Solidol-Based Lubricant Compositions with Mesogenic Copper Carboxylates Additives



L. V. Elnikova1, A. T. Ponomarenko2, V. G. Shevchenko2, V. V. Terentyev3, O. B. Akopova4

Author affiliations
1A. I. Alikhanov Institute of Theoretical and Experimental Physicse of NRC «Kurchatov Institute»,
25 Bolshaya Cheremushkinskaya St., Moscow, 117218, Russia Е-mail: elnikova@itep.ru
2N. S. Enikolopov Institute of Synthetic Polymeric Materials of RAS,
70 Profsoyuznaya St., Moscow, 117393, Russia Е-mail: Anapon@ispm.ru, Shev@ispm.ru
3Ivanovo State Agricultural Academy,
45 Soviet St., Ivanovo, 153012, Russia Е-mail: vladim-terent@yandex.ru
4Ivanovo State University, 39 Ermak St.,
Ivanovo, 153025, Russia Е-mail: ob_akopova@mail.ru

Abstract
Experimental results on electrical characteristics of lubricant compositions consisting of synthetic solidol with additions of copper isovalerate or copper valerate (dopant concentrations were varied from 1 to 20 wt. %) are presented. It was found that in the frequency range of 100 Hz – 1 MHz at different temperatures and concentrations the synthetic solidol-valerate and solidol-isovalerate systems showed two relaxation mechanisms. Maximum changes of electric conductivity on temperature were observed for the mixtures with copper valerate (5 and 10 wt. %) and with copper isovalerate (5 wt. %). According to polarization microscopy, the mixtures show areas of monotropic mesophase. The data obtained in this study will be used further for optimization of plastic lubricant compositions for different load-speed operation modes of friction units and to identify dependence of lubricant composition properties on isomeric structure of additive.

Keywords: dielectric permittivity, electrical conductivity, copper carboxylates, copper valerate, copper isovalerat, lubricant, liquid crystals, mesophase





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