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The marked changes in physical properties of elastomers which occur during aging as a result of the combined effect of heat, light, oxygen, and ozone are well known. Until recently, however, the nature of the chemical changes that occur during aging has been almost unknown. Some insight into the nature of these chemical reactions has been obtained during the last decade. It is the object of this paper to summarize the present status of knowledge concerning the chemical changes that occur in elastomers and antioxidants during aging. Only chemical changes occurring during thermal or photochemical oxidation will be considered.
Cole, J. O.
Research Laboratory, The Goodyear Tire and Rubber Co., Akron, Ohio