Abstract
An investigation was made of reactions of 2-tert-butylhydroquinone and 4-tert-butyl-pyrocatechol with tert-butylhydroperoxide and tetralylhydroperoxide in the presence and absence of a cobalt catalyst, modeling the transformations of these antioxidants during inhibited oxidation. The reaction product was a benzoquinone derivative in the first case and a mixture of benzoquinone and hydroxybenzoquinone, in the second. The formation of products also corresponded to the transformations of both isomeric tert-butylated benzoquinones caused by tert-butyl hydroperoxide. In agreement with the investigated model the same products of the oxidative transformation of dihydric phenols during inhibited oxidation of tetralin and atactic polypropylene were detected. Under the conditions for oxidative degradation of polyolefins at temperatures above 150°C, deactivation due to direct oxidation with oxygen must also be taken into account. The extent and rate of the formation of transformational products is one of the reasons for different antioxidative activity of isomeric dihydric phenols.
Published Version
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