THE EFFECT OF FUNCTIONAL NATURE ON THE DIELECTRIC PROPERTIES OF SLIGHTLY ALTERED LIGNINS

UDK 54.03, 54.04

  • Sergey Sergeevich Khviyuzov N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences https://orcid.org/0000-0002-4810-2378 Email: khviyuzov.s@yandex.ru
  • Konstantin Grigorievich Bogolitsyn N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences https://orcid.org/0000-0002-4055-0483 Email: k.bogolitsin@narfu.ru
  • Maria Arkadyevna Gusakova N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences https://orcid.org/0000-0002-2937-2604 Email: mariya_gusakova@mail.ru
DOI_disc_logo https://doi.org/10.14258/jcprm.20240212818
Keywords: lignin, phenolic hydroxyl groups, acidity constants, effective oxidative potential, relaxators

Abstract

One of the promising directions of using lignins is the application of their electrophysical properties. They are caused by the presence of a multifunctional aromatic nature, a conjugation system and a high reactivity in redox interactions. The objects of the study were slightly altered dioxanlignin of spruce and modified samples with different contents of carbonyl and methoxyl groups. The interrelation of the functional nature, reactionary (acid-base and redox) and dielectric properties of lignins was shown in this work. The change in the content of carbonyl groups leads to significant differences in the redox properties of the natural polymer. The changes in the values of the effective oxidative potential of the phenolic structures of lignin were up to 24 mV. The values of the electrical conductivity and the components of the complex permittivity in the frequency range of the alternating electric field from 10-2 to 107 Hz were determined by dielectric spectroscopy. Certain types of relaxators in the structure of lignins were identified according to the frequency dependences of the components of the complex permittivity to assess the effect of the functional nature of the polymer. The change in the content of carbonyl and methoxyl groups affects the values of the real part of the complex permittivity at alternating electric field frequencies less than 1 Hz. This allows us to consider lignin as a promising material for the manufacture of broadband electrical capacitors.

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Author Biographies

Sergey Sergeevich Khviyuzov, N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences

Candidate of Chemical Sciences, Senior Researcher at the Laboratory of Chemistry of Plant Biopolymers

Konstantin Grigorievich Bogolitsyn, N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences

Doctor of Chemical Sciences, Professor, Chief Researcher of the Laboratory of Chemistry of Plant Biopolymers

Maria Arkadyevna Gusakova, N. Laverov Federal Center for Integrated Arctic Research of the Ural Branch of the Russian Academy of Sciences

Candidate of Technical Sciences, Leading researcher of the Laboratory of Chemistry of Plant Biopolymers, Head of the laboratory

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Published
2024-06-12
How to Cite
1. Khviyuzov S. S., Bogolitsyn K. G., Gusakova M. A. THE EFFECT OF FUNCTIONAL NATURE ON THE DIELECTRIC PROPERTIES OF SLIGHTLY ALTERED LIGNINS // chemistry of plant raw material, 2024. № 2. P. 89-98. URL: http://journal.asu.ru/cw/article/view/12818.
Issue
No 2 (2024)
Section
Biopolymers of plants

Copyright (c) 2024 chemistry of plant raw material

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