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Mechanism of antioxidant action in the stabilization of hydrocarbon systems
Author(s) -
Shelton J. Reid
Publication year - 1959
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1959.070020616
Subject(s) - antioxidant , kinetic isotope effect , chemistry , hydrocarbon , mechanism (biology) , amine gas treating , hydrogen , hydrogen atom abstraction , mechanism of action , deuterium , organic chemistry , photochemistry , biochemistry , philosophy , physics , epistemology , quantum mechanics , in vitro
Four antioxidant classifications, based on differences in the method by which they exert their effect, are noted. The mechanism of the chain‐stopping action is discussed in terms of four different reactions which have been proposed. The participation of the antioxidant in the mechanism of inhibited thermal oxidation is reviewed. The hydrogen donation mechanism as the first step in the chain‐stopping mechanism has been investigated by observing the effect of replacing the active hydrogen of the antioxidant by deuterium. Contrary to the findings of some prior workers, a kinetic isotope effect has been demonstrated with a secondary aryl amine antioxidant as well as with phenols. These results, together with other supporting evidences reported in the literature, indicate that abstraction of a hydrogen from the antioxidant is the initial step in the usual mechanism by which antioxidants serve as chain stoppers in the oxidation of hydrocarbon systems.