Polyblend system sof polyurethane (AU) and Ethylene acrylic elastomer(vamac)using the sulfur cure systems

摘要

Blends of polyurethane (Vibrathane-5008, Uniroyal Co., USA) and ethylene acrylic elastomer (vamac B-124, du Pont, USA) prepared through three different blending techniques have been studied over the entire composition range. The process-ability and the aging properties of the polyurethane elastomer were improved as a result of blending with ethylene acrylic elastomer. IR spectral analysis of the (50:50) blend of the two elastomers, without any curatives, suggested that the interchain crosslinking reaction occurred between the two elastomers phases on heat treatment. The thermal stability of the blends also improved on heat treatment, before addition of curatives. Phase morphological study revealed that the extractability of the single phase by solvent was also restricted on preheating the preblends, probably due to the interchain crosslinking.