As was indicated earlier,1 the major part in the process of ageing of polymeric materials is played by free radicals formed either on homolytical scission of the main chain or on homolytical detachment of side group atoms or radicals. In terms of the offered classification,1 the ageing process includes, in the general case, three main stages: 1) initiation-the stage of formation of active centres; 2) development of ageing-the stage which determines the major changes in the properties of a polymeric material; 3) the stage of decay of the active centres of ageing.
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Melnikov et al. (1996) studied this question.
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