Abstract
Abstract Free radicals were generated in a composite of polypropylene filled with silica by the effect of gamma radiation and subsequently they were measured by the ESR method. The concentrations of free radicals were determined in the course of gradual heating of the samples in the interval from −50 to 100 °C. The concentrations of free radicals in the samples fatigued by simple bending were higher than the concentrations of free radicals in non-fatigued samples. The gradual fatigue of material brings about a change in structure and a decrease in mobility of the polymer chains owing to which the decay of free radicals is inhibited.
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