Skip to Main content Skip to Navigation
Theses

Radio-oxydation d'un élastomère de type EPDM lors d'irradiations faiblement ou fortement ionisantes :mesure et modélisation de la consommation de dioxygène

Abstract : Usually, the irradiation of polymers under ionising radiations occurs in air that is in the presence of oxygen. This leads to a radio oxidation process and to oxygen consumption.
Our material is an EPDM elastomer (ethylene propylene 1,4 hexadiene) used as insulator in control-command cables in nuclear plants (Pressurised Water Reactor).
A specific device has been conceived and built up during this PhD work for measuring very small oxygen consumptions with an accuracy of around 10%.
Ionising radiations used are electrons at 1 MeV and carbon ions at 11 MeV per nucleon. Under both electron and ion irradiations, the influence of oxygen pressure on oxygen consumption has been studied in a very large range : between 1 and 200 mbar. In both cases, the yield of oxygen consumption is constant in-between 200 and 5 mbar. Then, at lower pressures, it decreases appreciably. On the other hand, the oxygen consumption during ion irradiation is four times smaller than during electron irradiation. This emphasizes the role of the heterogeneity of the energy deposition at a nanometric scale.
The adjustment of the experimental results obtained during electron irradiation with the general homogeneous steady-state kinetic model has allowed extracting all the values of the kinetic parameters for the chosen mechanism of radio oxidation. The knowledge of these numbers will allow us to face our results obtained during ion irradiation with a heterogeneous kinetic model under development.
Complete list of metadatas

Cited literature [39 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00011471
Contributor : Emmanuel Balanzat <>
Submitted on : Thursday, January 26, 2006 - 3:08:54 PM
Last modification on : Tuesday, February 5, 2019 - 12:12:10 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:51:03 PM

Identifiers

  • HAL Id : tel-00011471, version 1

Citation

Nicolas Dély. Radio-oxydation d'un élastomère de type EPDM lors d'irradiations faiblement ou fortement ionisantes :mesure et modélisation de la consommation de dioxygène. Physique [physics]. Université de Caen, 2005. Français. ⟨tel-00011471⟩

Share

Metrics

Record views

641

Files downloads

364