Devulcanization of ethylene‐propylene‐diene monomer rubber waste. Effect of diphenyl disulfide derivate as devulcanizing agent on vulcanization, and devulcanization process

A systematic study was performed to understand the effects of devulcanizing agent dibenzamido diphenyl disulfide (DBD) on vulcanization and devulcanization process a sulfur-cured ethylene-propylene-diene monomer (EPDM) rubber. The influence DBD investigated by mixing with virgin rubber curative system. waste achieved varying amounts ranging from 0.4 13.8 wt% temperatures 150 200°C. quality vulcanizates devulcanizates evaluated rheometer tests, temperature scanning stress relaxation measurements, analysis mechanical properties. During vulcanization, acts as an accelerator in presence sulfur. When accelerators are added, scorch time increases, cure rate decreases. Thus, retarder. In activators, leads significant reduction crosslink density. This results composites high elongation at break poor compression set values. efficiency depends strongly concentration temperature. monosulfidic crosslinks cleaved low concentrations DBD, while polysulfidic require higher concentrations. These show that is effective degrades network below