Abstract
Abstract The rubber hydrocarbon, which presents two reactive sites for each isoprenic unit: the double bond and the α-methylenic carbon, is highly sensitive to the action of oxygen. It is known that different products can react with rubber, some by addition on the double bonds, others by combination to the α-methylenic carbons and we have attempted to determine the influence that these modifications might have on oxidizability. The reagents chosen were maleic anhydride to block the α-methylenic carbons and saligenol to saturate the double bonds. Modified rubbers containing varying proportions of these reagents were prepared and their oxidizabilities at 80° C were measured, using the manometric method. In both cases an important decrease of oxidizability was noted, which went far beyond what might have been expected from the small proportion of reactive groups combined; differences in the oxidation kinetics were also observed, according to the mode of combination to the rubber hydrocarbon of the two types of reagent used. These results show that it is possible, in this way, to improve the resistance of raw rubber to oxidation and that this will probably influence the behavior of vulcanizates.
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