Self-Inhibition in the Oxidation of Butadiene-Acrylonitrile Rubbers

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Abstract
Because of their valuable technical properties, copolymers of butadiene and acrylonitrile rubbers have found wide use in the rubber industry in the production of oil-resistant and heat-resistant products. Investigations have established that, during the copolymerization of butadiene with acrylonitrile, the latter enters principally at the 1,4-position of the main chain. This is observed most clearly with relatively large concentrations of acrylonitrile. Our own work showed that the double bonds in the main hains of the rubber molecules are the most active points in the chain. It indicated also that butadiene-acrylonitrile rubbers should oxidize at a fast rate. However, in reality they show great chemical stability. The present study is devoted to an explanation of the nature of oxidation of butadiene-acrylonitrile rubbers. Both the free and inhibited oxidation of copolymers containing, respectively, 20, 29.6 and 35 per cent of acrylonitrile (CKH-18, CKH-26, and CKH-40) was studied. Before oxidation, the rubbers were purified by extraction and double precipitation from benzene solutions. The rubber films were prepared and oxidized with molecular oxygen according to methods described previously.

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