Abstract
Nanocomposites based on poly(ethylene-co-vinyl acetate) (EVA) and acrylonitrile-butadiene rubber (NBR) with 50 wt% NBR and 5 wt% organoclay (OC) content were dynamically cross-linked with 0–2 wt% dicumyl peroxide (DCP). The x-ray diffraction and transmission electron microscopy results showed that the extent of exfoliation of the OC layers increased with the addition of DCP. The results of the tensile tests revealed that the values of tensile strength, yield stress, elastic modulus and the modulus at 100% and 300% strain were gradually increased with the increase in DCP content. Thermal analysis studies indicated that the nucleation rate for the cross-linked nanocomposites progressively decreased and the crystallite size distribution became wider with increasing in the amount of DCP. Moreover, the relaxation ratio and relaxation rate index were decreased by 38.8 and 66.4%, respectively, for the nanocomposite cross-linked with 2 wt% DCP in comparison with those of the uncross-linked counterpart.
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