Solubility and mobility of sulfur in copolymers of ethylene/propylene and ethylene/butene-1 were determined, using S 35 according to the method developed by Auerbach and Gehman for natural rubber and certain polymers and copolymers possessing elastomeric properties. We took into consideration the effect of temperature and copolymer composition, both on the solubility and on the mobility of the sulfur. Also examined was the effect of the migration of sulfur to the surface of the vulcanized product. The results are discussed in relation to the characteristics of the vulcanization process.

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Rubber Division, American Chemical Society, Inc.
1963
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