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Article

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

Polymer Institute of the Slovak Academy of Sciences, Dúbravská Cesta 9, 845 41 Bratislava, Slovakia
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Polymers 2022, 14(17), 3640; https://doi.org/10.3390/polym14173640
Submission received: 2 August 2022 / Revised: 23 August 2022 / Accepted: 29 August 2022 / Published: 2 September 2022

Abstract

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.
Keywords: electroconductive rubber composite; mechanical deformation; vulcanization time; crosslink density; conductive pathway electroconductive rubber composite; mechanical deformation; vulcanization time; crosslink density; conductive pathway

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MDPI and ACS Style

Peidayesh, H.; Špitalský, Z.; Chodák, I. Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation. Polymers 2022, 14, 3640. https://doi.org/10.3390/polym14173640

AMA Style

Peidayesh H, Špitalský Z, Chodák I. Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation. Polymers. 2022; 14(17):3640. https://doi.org/10.3390/polym14173640

Chicago/Turabian Style

Peidayesh, Hamed, Zdenko Špitalský, and Ivan Chodák. 2022. "Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation" Polymers 14, no. 17: 3640. https://doi.org/10.3390/polym14173640

APA Style

Peidayesh, H., Špitalský, Z., & Chodák, I. (2022). Electrical Conductivity of Rubber Composites with Varying Crosslink Density under Cyclic Deformation. Polymers, 14(17), 3640. https://doi.org/10.3390/polym14173640

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