Kinetic modelling of radiochemical ageing of ethylene-propylene copolymers
Article dans une revue avec comité de lecture
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
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Article dans une revue avec comité de lectureRICHAUD, Emmanuel; COLIN, Xavier; MONCHY-LEROY, Carole; AUDOUIN, Ludmila; VERDU, Jacques (Wiley, 2011)The radiochemical degradation of bisphenol A polysulfone was investigated under a γ-ray dose rate of 24 kGy h-1 up to 30.7 MGy total absorbed dose at 60 °C using gel permeation chromatography, sol-gel analysis, glass ...
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Article dans une revue avec comité de lectureAUDOUIN, Ludmila; COLIN, Xavier; FAYOLLE, Bruno; RICHAUD, Emmanuel; VERDU, Jacques (EDP Sciences, 2010)It has been supposed, for a long time, that kinetic modelling of polymer ageing for nonempirical lifetime prediction was out of reach for two main reasons: hypercomplexity of mechanisms and heterogeneity of reactions. The ...