Effects of Posttreatments on the Storage Stability of Reclaimed Rubber

Figure 1

Schematics of the possible chemical reactions during the waste tire reclamation involving activator 450. Under the heating and mechanical shearing, the disulfide bonds in the activator can break, resulting in sulfenyl radicals (a), and the S-S crosslinks and C-C bonds in the rubber can cleave, resulting in molecular segments with radicals (b). The radical species on the molecular fragments can get neutralized by coupling with each other or with the sulfenyl radicals produced.

(a)

(b)

(c)

(d)