EPDMおよびEPMのペルオキシド加硫における液状ポリマーの添加効果

概要

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On the peroxide cure and sulfur cure of EPDM and EPM, the effects of various liquid polymers were studied. Liquid 1.4-diene polymer (SBR, NBR) having olefinic double bonds and liquid 1.2-diene polymer having pendant vinyl groups were used.In the peroxide cure of EPDM and EPM, the mooney scorch rate was retarded by adding liquid diene polymers, and promoted by adding liquid polychloroprenes.The mooney scorch rate in the peroxide cure of EPDM was accelerated with increasing liquid thiokol.But in the peroxide cure of EPM, it was retarded with increasing liquid thiokol.In the sulfur cure of EPDM, it was promoted by adding liquid 1.4-diene polymer (SBR, NBR), but it was retarded by adding liquid 1.2-diene polymer (1.2 BR).In the peroxide cure of EPDM and EPM, the crosslinking density, modulus, tensile strength and hardness were decreased by addition of liquid SBR, NBR and thiokol, but increased by addition liquid 1.2 BR and CR.It was found also that the resistance to hot air degradation of EPM vulcanizate were improved by adding liquid polymers.