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Copolymerization of N-(l(-naphthylmaleimide with vinylacetate was investigated in different solvents. The solvent was found to play an important role in the reactivity of the maleimide due to molecular association of solvent/monomer molecules. The overall rate of copolymerization was found to increase as the ability of the solvent to associate with the maleimide increased. ZnC12 enhanced the reactivity of the maleimide due to a complex formation with growing radicals. The effect of substitution with a phenyl group on the reactivity of the double bond was also investigated. KEY WORDS Copolymerization / N-Arylmaleimides-vinylacetateReactivity Ratios I Solvent Effect / Zinc Chloride /

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ABSTRACT:A systematic dielectric and mechanical study was carried out on an ethylene propylene diene monomer (EPDM) and a nitrile rubber (NBR) blended with polyacrylamide (PAM). From the compatibility investigations, it was found that EPDM/ PAM is incompatible while NBR/PAM is semicompatible. To overcome the problem of phase separation between rubber and PAM, PAM was grafted with two different monomers, acrylonitrile (AN) and acrylic acid (AA), and added with 10 phr to both EPDM and NBR. Poly(vinyl chloride) (PVC) was also added as a compatiblizing agent to both types of blend. It was concluded that the addition of either a grafted polymer or PVC to the rubber-plastic blend could improve to some extent the compatibility of such blends.

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