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Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation

Studies addressing electroconductive composites based on rubber have attracted great interest for many engineering applications. To contribute to obtaining useful materials with reproducible behavior, this study focused on understanding the mechanism of conductivity changes during mechanical deforma...

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Detalles Bibliográficos
Autores principales: Peidayesh, Hamed, Špitalský, Zdenko, Chodák, Ivan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9460271/
https://www.ncbi.nlm.nih.gov/pubmed/36080717
http://dx.doi.org/10.3390/polym14173640
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author Peidayesh, Hamed
Špitalský, Zdenko
Chodák, Ivan
author_facet Peidayesh, Hamed
Špitalský, Zdenko
Chodák, Ivan
author_sort Peidayesh, Hamed
collection PubMed
description Studies addressing electroconductive composites based on rubber have attracted great interest for many engineering applications. To contribute to obtaining useful materials with reproducible behavior, this study focused on understanding the mechanism of conductivity changes during mechanical deformation for rubber composites based on styrene-butadiene rubber (SBR) or ethylene-propylene-diene terpolymer (EPDM) vulcanized for various times. The composites were characterized by static electrical conductivity, tensile testing, dynamic mechanical thermal analysis (DMTA), and crosslink density measurements. The tensile strength and Young’s modulus were found to increase significantly with rising vulcanization time. Higher static conductivity values of the composites were observed with the increase in vulcanization time. The most important aspect of this investigation consisted in the electrical current measurement online with recording the stress-strain curves, revealing the details of the uniaxial cyclic deformation effect on changes in the structure of conductive pathways indirectly. The electrical conductivity during five runs of repeated cyclic mechanical deformations for SBR composites increased permanently, although not linearly, whereas EPDM composites showed a slight increase or at least a nearly constant current, indicating healing of minor defects in the conductive pathways or the formation of new conductive pathways.
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spelling pubmed-94602712022-09-10 Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation Peidayesh, Hamed Špitalský, Zdenko Chodák, Ivan Polymers (Basel) Article Studies addressing electroconductive composites based on rubber have attracted great interest for many engineering applications. To contribute to obtaining useful materials with reproducible behavior, this study focused on understanding the mechanism of conductivity changes during mechanical deformation for rubber composites based on styrene-butadiene rubber (SBR) or ethylene-propylene-diene terpolymer (EPDM) vulcanized for various times. The composites were characterized by static electrical conductivity, tensile testing, dynamic mechanical thermal analysis (DMTA), and crosslink density measurements. The tensile strength and Young’s modulus were found to increase significantly with rising vulcanization time. Higher static conductivity values of the composites were observed with the increase in vulcanization time. The most important aspect of this investigation consisted in the electrical current measurement online with recording the stress-strain curves, revealing the details of the uniaxial cyclic deformation effect on changes in the structure of conductive pathways indirectly. The electrical conductivity during five runs of repeated cyclic mechanical deformations for SBR composites increased permanently, although not linearly, whereas EPDM composites showed a slight increase or at least a nearly constant current, indicating healing of minor defects in the conductive pathways or the formation of new conductive pathways. MDPI 2022-09-02 /pmc/articles/PMC9460271/ /pubmed/36080717 http://dx.doi.org/10.3390/polym14173640 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Peidayesh, Hamed
Špitalský, Zdenko
Chodák, Ivan
Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title_full Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title_fullStr Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title_full_unstemmed Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title_short Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation
title_sort electrical conductivity of rubber composites with varying crosslink density under cyclic deformation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9460271/
https://www.ncbi.nlm.nih.gov/pubmed/36080717
http://dx.doi.org/10.3390/polym14173640
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