Variation of the effectiveness of inhibitors reacting with free radicals and its effect on the optimal composition of the synergistic mixture

Abstract

1. Rules applying to the change in optimal synergistic mixture composition under variation of the antiradical activity of the mixture components have been developed from experimental data and the results of computer modeling of the reaction scheme for hydrocarbon oxidation in the presence of two inhibitors, each capable of reacting with RO2. 2. Increasing the value of the rate constant for interaction with peroxide radicals of aromatic amines and diamines decreases the concentrations of these compounds in optimal synergistic mixtures with sterically shielded phenols. 3. The regularities observed here trace back to a competition between regeneration of the more active inhibitor through the Am + PhOH → AmH + PhO. reaction, and chain propagation by the inhibitor radicals through the reaction Am.+RH→ AmH+R.(RO2).