Abstract
Quantitative analysis of the solubility data of irradiated rubber, using the method adopted by Charlesby and Pinner, has been applied to the study of the cross-linking reaction. The rate of cross-linking is directly proportional to the radiation intensity and corresponds to a G-value of 0·83 at 25°C. The activation energy of the cross-linking reaction is 0·76 and 0·26 kcal above and below the glass transition temperature, respectively. The ratio of dislinking to cross-linking is 0·05. It is largely independent of radiation intensity and temperature. Radiation induces the formation of some trans-vinylene unsaturation, believed to arise from a double bond shift. A considerable amount of terminal unsaturation, believed to arise as a result of dislinking, is also formed.
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