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Re‐Gradation of Photo‐Oxidized Post‐Consumer Greenhouse Films
Author(s) -
La Mantia Franceso P.,
Dintcheva Nadka Tzankova
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400534
Subject(s) - gradation , branching (polymer chemistry) , plastics extrusion , materials science , polymer , composite material , polyethylene , degradation (telecommunications) , chemical engineering , polymer chemistry , computer science , telecommunications , engineering , computer vision
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.