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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