Kinetic modelling of radiochemical ageing of ethylene–propylene copolymers

A non-empirical kinetic model has been built for describing the general trends of radiooxidation kinetics of ethylene–propylene copolymers (EPR) at low γ dose rate and low temperature. It is derived from a radical chain oxidation mechanism composed of 30 elementary reactions: 19 relative to oxidatio...

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Bibliographic Details
Published in:Radiation physics and chemistry (Oxford, England : 1993) England : 1993), 2010-03, Vol.79 (3), p.365-370
Main Authors: Colin, Xavier, Richaud, Emmanuel, Verdu, Jacques, Monchy-Leroy, Carole
Format: Article
Language:English
Subjects:
Cooxidation
Copolymers
Engineering Sciences
Ethylene
Ethylene–propylene copolymers
Kinetic modelling
Materials
Mathematical models
Methylene
Oxidation
Polyethylenes
Polypropylenes
Radiochemical ageing
Reaction kinetics
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Summary:A non-empirical kinetic model has been built for describing the general trends of radiooxidation kinetics of ethylene–propylene copolymers (EPR) at low γ dose rate and low temperature. It is derived from a radical chain oxidation mechanism composed of 30 elementary reactions: 19 relative to oxidation of methylene and methyne units plus 11 relative to their eventual cooxidation. The validity of this model has been already checked successfully elsewhere for one homopolymer: polyethylene (PE) ( Khelidj et al., 2006a,b; Colin et al., 2007). In the present study, it is now checked for polypropylene (PP) and a series of three EPR differing essentially by their mole fraction of ethylene (37%, 73% and 86%) and their crystallinity degree (0%, 5% and 26%). Predicted values of radiation-chemical yields are in good agreement with experimental ones published in the last half past century.
ISSN:0969-806X
1879-0895
DOI:10.1016/j.radphyschem.2009.08.019