Abstract

Thermal oxidation of PP films at 80°C was examined as a function of aging time, sample thickness, polymer grade and sample preparation. The variation of the formation of oxidation products with sample thickness shows that the good fit of the data deduced from formal homogeneous kinetics is quite fortuitous. The heterogeneous oxidation model developed initially for PE-LD and based on rapid oxidation of individual amorphous domains, followed by spreading of this oxidation to nearby domains, is applied successfully to PP. The heterogeneous kinetics based on this model fit well the experimental kinetics of the oxidation products. Therefore, the model seems to be valid for polyolefins in general.

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