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Polyblends of Polyurethane and EVA Elastomers (Peroxide cure)

Abstract Blends of polyurethane and EVA elastomers prepared by two different techniques, in different blend ratios, have been studied. Blend properties largely depended on the blend ratio and also blending techniques. Preheating technique offered better properties. IR spectral analysis revealed that on heating interchain crosslinking occured between PU and EVA. The degradation and weight loss were also retarded. Furthermore, preheating also restricted the extractibility of one phase by solvent extraction suggesting interchain crosslinking. Heat of vulcanization also confirmed the above view.