Abstract
Abstract Di(trichloromethyl) sulfone and dichloromethylene-bis(trichloromethyl sulfone) can vulcanize saturated hydrocarbon elastomers like EPR when used in combination with sulfur. The activity is enhanced by the presence of certain metal oxides. These agents are also effective in some other elastomers, and in their blends with EPR. They are also effective in combinations with octachlorocyclopentene, and with cumyl peroxide. Synergistic effects are observed in the tensile properties of such systems. Dichloromethylene-bis(trichloromethyl sulfone) is so active in EPR that it gives rise to scorch. Efforts to alleviate this drawback by the use of sulfur donor compounds or retarders, and by other means, have not yet proved to be successful. Di (trichloromethyl) sulfone appears to be quite tolerable as far as scorch is concerned, but its lachrymatory nature might be a disadvantage in large-scale non-vented processing operations. Chemical studies carried out with model systems indicate that perchloromethyl sulfones do not all follow the same mechanism in the vulcanization of saturated hydrocarbon elastomers. Reaction schemes are proposed for the behavior of some of the sulfones investigated.
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