Abstract
Blown extruded films of low-density polyethylene (LDPE) have been subjected to climatic ageing in a sub-Saharan facility at Laghouat (Algeria) with direct exposure to sun. Samples were characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC) techniques after prescribed amounts of time up to 8 months. It has been shown via these two techniques that crystallinity increases with exposure time. The reason of these morphological changes is relevant to photooxidative reactions leading to crosslinking in the beginning and to chain scissions for an advanced stage of ageing. The short chain segments resulting from scission reactions increase the crystallinity of the film via a chemocristallisation process.
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