Abstract
AbstractEthylene–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 strengthσand strain at breakεof 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% ofσandεwere recovered, respectively. To prevent property degradation, 200°C was required at 3.9 wt% DBD, resulting in 97% and 95% ofσandε, but only 70% of hardness.
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