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Summary: The degradation undergone by the polymers during their use and because of the thermo‐mechanical degradation undergone during the reprocessing operations provokes, among other effects, the decrease of the molecular weight. The change of the molecular architecture is responsible for the deterioration of all the properties. In order to restore the properties of post‐consumer recycled plastics, some rebuilding of the molecular structure is necessary. In this work, photo‐oxidized films for greenhouses were reprocessed in presence of additives able to react with the polyethylene in order to form branching and cross‐linking, improving the properties of these post‐consumer plastic. Pressure as a function of time in the mini twin‐screw extruder, processing speed 70 rpm. magnified image Pressure as a function of time in the mini twin‐screw extruder, processing speed 70 rpm.
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Mantia et al. (2005) studied this question.
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