Specialty polyblend systems of polyurethane rubber and ethylene acrylic rubber (peroxide cure)

Polyblends of polyurethane (AU) and ethylene acrylic rubber (Vamac) have be en prepared using two different blending techniques to develop new polymeri c materials. The overall study was carried out using DCP as a curative, whe re both the phases were vulcanized. The state of cure gradually decreased w ith the increment of Vamac content. Preblended sample hardness and modulus followed the same trend with state of cure, but the tensile strength and el ongation at break increased with increase of the Vamac dose. Preheated preb lended samples follow the same trend. IR spectral analysis of the AU/Vamac blend, without any curative, revealed that interchain crosslinking is forme d between two elastomers on heat treatment. High-temperature DSC/TGA sugges ted the enhanced thermal stability of the preheated preblended sample. From SEM study, it is observed that the preheating of the preblend restricts th e extraction of single phase in solvents due to the formation of interchain crosslinks.