Abstract
The effective lifetimes of many orientated polymers like polypropylene films and fibres are defined in terms of the time required for a given environment to promote a sudden change in a macroscopic property ; often catastrophic failure may follow such a change. TGA may be used to investigate the microscopic physico-chemical changes which occur during the induction period of thermally-aged polypropylene. Marked shifts in the temperatures of the onset and maximum rates of mass loss accompanying post-fusion oxidation of aged orientated films are observed which reflect the slight changes in macroscopic properties that also occur during the induction period. The apparent kinetic parameters of unaged and aged film post-fusion oxidations are determined.
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