Polymers, Vol. 18, Pages 137: Silicon Effect on Conductive Behavior in Rubber Recycled Composites

Polymers doi: 10.3390/polym18010137

Authors:
Marc Marín-Genescà
Ramon Mujal Rosas
Jordi García Amorós
Lluis Massagues
Xavier Colom

In the present research, the structure and thermal–dielectric behavior of Styrene Butadiene Rubber (SBR) and of the SBR/EPDMd composite with SiO2 with different compositions and concentrations of EPDMd are analyzed. In this sense, interesting behaviors are observed for the DC-AC regime of the conductive behavior of the material; therefore, a very marked DC and AC regime is observed in the conductivities, showing a different dielectric behavior at low and high frequencies. On the other hand, peak relaxations due to polarization phenomena are observed in terms of the imaginary modulus. Conductively, SiO2 does not produce significant or relevant changes, but it does produce changes in the permittivity and the electrical modulus, so it is concluded that the impact of the incorporation of SiO2 in these compounds affects energy storage (permittivity and modulus) in these types of compounds. Compared with compounds without silica (insights—no SiO2), it is observed that SiO2 maintains a similar operating regime to the initial one (SBR and SBR + EPDMd + SiO2) without SiO2 dielectric changes occurring, so silica presence modifies the dielectric behavior, reducing polarization effects, as can be seen in the dielectric results. Conductively, SiO2 produces more insulating compounds, that is, less conductive; this property can make it interesting as electrical insulation.

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