Vulcanization kinetics of low unsaturation rubbers (butyl rubber, ethylene propylene dicyclopentadiene terpolymer, and ethylene propylene cyclooctadiene terpolymer) have been studied by assuming that it involves a crosslinking reaction and a cleavage of sulfur bridges already formed. The crosslinking reaction can be explained by assuming a second order mechanism with respect to the concentration of the double bonds, whereas the cleavage reaction can be explained by assuming a first order mechanism with respect to the concentration of the sulfur crosslinks already formed. The overall vulcanization reaction has been followed through the variations of the moduli (at 200 per cent and at 300 per cent) and of the elongation at break. The crosslinking rate constant has been found to vary depending on the type of elastomer; decreasing in the order ethylene propylene cyclooctadiene terpolymer > butyl rubber > ethylene propylene dicyclopentadiene terpolymer.

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