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Modelling of thermal oxidation of phosphite stabilized polyethylene

Article dans une revue avec comité de lecture
Author
DJOUANI, Fatma
VERDU, Jacques
ccFAYOLLE, Bruno
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccRICHAUD, Emmanuel

URI
http://hdl.handle.net/10985/17899
DOI
10.1016/j.polymdegradstab.2011.03.014
Date
2011
Journal
Polymer Degradation and Stability

Abstract

The thermal oxidation behaviour of polyethylene films stabilized by various weight ratios of organophosphites (Irgafos 168) has been studied at selected temperatures. The duration of the induction period was found to increase proportionally with the stabilizer concentration, even at temperatures as low as 80 °C. Particular attention was paid to the phosphite-phosphate conversion during the induction period. A kinetic model, involving volatile and partially soluble hydroperoxide decomposers, was developed in order to simulate these results. With the use of kinetic parameters that can be at least tentatively justified from theoretical considerations, this model gave simulations in reasonable agreement with the experimental observations for stabilizer depletion and carbonyl formation. Of particular note is the fact that, even for non-trivial results such as the shape of the phosphite versus phosphate concentration plots, or phosphate build-up, there was also a quite good agreement.

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