Mechanochemical devulcanization of EPDM rubber waste. Correlation of process parameters with sol–gel analyses and revulcanization properties

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Abstract

Ethylene–propylene–diene rubber (EPDM) scrap was devulcanized in an internal mixer with varying amounts of dibenzamido diphenyl disulfide (DBD) at temperatures below 200°C. The devulcanization effect and sol–gel analyses of the devulcanizates, and the mechanical properties of the sulfur-cured revulcanizates were studied. Residual DBD was still present in the sol at 160°C and degraded DBD at 200°C. DBD affects the curing leading to poor properties. So, the temperature must be adjusted according to the DBD concentration to obtain a superior recyclate for sealing systems. At 0.4 wt% DBD, the degradation reaction was already complete at 120°C, but only 52% and 61% of the tensile strength σ and strain at break ε of the virgin material were achieved. At 160°C and 2 wt%, the degradation reaction was complete, and the DBD effect on properties was small; 65% and 86% of σ and ε were recovered, respectively. To prevent property degradation, 200°C was required at 3.9 wt% DBD, resulting in 97% and 95% of σ and ε, but only 70% of hardness.

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Gschwind, L., Jordan, C. S., Vennemann, N., & Susoff, M. L. (2023). Mechanochemical devulcanization of EPDM rubber waste. Correlation of process parameters with sol–gel analyses and revulcanization properties. Journal of Applied Polymer Science, 140(17). https://doi.org/10.1002/app.53768

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