Use of polymers in various severe conditions requires detailed information concerning their rate of oxidation. Oxygen can be considered as the most important factor involved in significant changes of material behaviour, whose damaging effect is always accompanied by other processes caused by humidity, light radiation or many other environmental factors. The presence of double bonds and branching in the macromolecular chains of the polymer increases the oxidation rate, even if a stabilization agent is present [1-3]. Thus, special attention must be paid to the degradation of material, starting from its manufacture up to the service time.
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