N. Suma et al., IMPROVED MECHANICAL-PROPERTIES OF NR EPDM AND NR BUTYL BLENDS BY PRECURING EPDM AND BUTYL, Journal of applied polymer science, 49(3), 1993, pp. 549-557
Ethylene-propylene-diene rubber (EPDM) and isobutylene-isoprene rubber
(IIR) were compounded, precured to a low degree, and then were blende
d with natural rubber (NR). The compounding ingredients for NR were th
en added and the final curing was done. NR/EPDM and NR/IIR blends, pre
pared using this method, were found to possess much improved mechanica
l properties as compared to their conventional counterparts. The optim
um precuring crosslink density that has to be given to the EPDM and II
R phases has been determined.