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Based on the data reported in this paper, it is evident that the zinc salts of acrylic acid and methacrylic acid are effective coagents for the peroxide curing of EPDM and NBR. They appear to be unique among coagents in their ability to maintain high elongation while increasing the hardness and tensile properties of these elastomers. Zinc diacrylate was found to be the most effective in providing high hardness and high tensile properties. Zinc dimethacrylate gave a slightly better balance of properties by providing the highest elongation for a given hardness or modulus value.
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Costin et al. (1991) studied this question.
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