Abstract
A calorimetric study was made of the effect of static deformation on oxidation kinetics of a peroxide vulcanizate of polyisoprene containing a small proportion of combined sulphur. The effect of static deformation varies at different stages of oxidation. At the initial stage sulphides are oxidized and the process is considerably accelerated by the stress formed under static deformations. The effect of static deformation at the stage of auto-catylysis hinders oxidation, reducing the rate constant and increasing the activation energy of this process as a result of a reduction in the conformation mobility of macromolecules.
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