They increased the cross-link densities of the vulcanizates. Coagent TMPTMA is applicable where high modulus and ageing resistance are required.
Allylic coagent TAC (Type II) increased the cross-link density of the vulcanizate at lower concentrations. As the concentration of coagent increased from 5 to 10 phr, cyclization predominated andTACforms a dispersed phase that is incompatible with NR, resulting in a considerable reduction in cross-link density.