Abstract
Polycarbonate was subjected to long-term stress by transverse bending. Stressed, as well as non-fatigued, samples were irradiated by gamma radiation in evacuated ampoules. The concentration of free radicals was measured by ESR in the course of gradual heating of the samples. It appeared that the free radicals in the samples subjected to long-term stress were more stable than the free radicals in the non-fatigued samples. This suggests that the arrangement of polymer chains changes during fatigue and the free volume in the proximity of radical centres decreases so that the transfer of these centres to adjoining chains is retarded.
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