Induction time and later degradation of outdoor exposed polypropylene cast film studied by differential scanning calorimetry

The outdoor ageing of a polypropylene (PP) cast film, free of stabilisers and exposed directly or covered by glass, has been studied mainly by means of differential scanning calorimetry (DSC) measurements. Time dependences of the enthalpies and the peak temperatures of all the samples are not straig...

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Bibliographic Details
Published in:Polymer degradation and stability 1997, Vol.55 (2), p.199-207
Main Authors: Gallo, Raffaele, Severini, Febo, Ipsale, Salvatore, Del Fanti, Natalino
Format: Article
Language:English
Subjects:
Applied sciences
Chemical reactions and properties
Degradation
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
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Summary:The outdoor ageing of a polypropylene (PP) cast film, free of stabilisers and exposed directly or covered by glass, has been studied mainly by means of differential scanning calorimetry (DSC) measurements. Time dependences of the enthalpies and the peak temperatures of all the samples are not straight lines. The recurrence of high and low values of these quantities has been related to the organization of the system from the starting polypropylene matrix and from the occurring oxygenated fragments. In fact, meaningful changes in these thermal parameters take place even during the first 800 exposure hours, in the absence of oxidation. This shows that the oxidation reaction of the system is preceded by considerable morphological changes in the material.
ISSN:0141-3910
1873-2321
DOI:10.1016/S0141-3910(96)00134-6