SPECIALITY POLYBLEND SYSTEM OF CARBOXYLATED NITRILE RUBBER AND ETHYLENE ACRYLIC RUBBER

Blends of XNBR and Vamac prepared by three different techniques have b een studied in different proportions. Blend properties largely depend on the blend ratio and also on the blending technique. A preblending t echnique offers better properties. In the case of the curative masterb atch technique, poor physical properties were obtained because of a cu re rate mismatch. A slightly precured XNBR masterbatch when blended wi th a Vamac masterbatch gives rise to improved properties. IR spectra r eveal that interchain crosslinking occurs between Vamac and XNBR, alth ough preheating does not have any remarkable effect on the blend prope rties, merely delaying the degradation process.