Abstract
A study has been made of the influence of air pressure (up to 30 MPa) at 30–130° on the relaxation properties of a butadiene-methylstyrene elastomer. A pressure increase results in retardation of physical relaxation and leads to some augmentation of the activation energy owing to increased intermolecular interaction and to a free volume reduction. Chemical relaxation is accelerated in a high pressure air medium, and the activation energy is reduced. This reduction is the result of an intensification of thermooxidative processes on account of an increase in the concentration of dissolved ocygen in the elastomer.
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