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On the radio-oxidation, at high doses, of an industrial polyesterurethane and its pure resin

Abstract : The polymers present in the cemented technological waste packages degrade under radio-oxidation. In the context of the geological nuclear waste storage, the long-term behavior of these polymers must be better understood, especially at high doses. The general objective is to ensure the safety of the geological underground repository. In this study, we focus on an industrial polyesterurethane, used as a glove of gloves boxes, and its pure resin. These two materials were radio-oxidized at different high doses and the modifications induced by irradiation using low ionizing rays were assessed through the study of the gas release, the in-chain modifications, and the formation of molecules of low molecular mass.The gas release has been quantified by gas mass spectrometry up to doses as high as 4 000 kGy and 10 000 kGy the evolution with dose is slight and is increasing only in the case of carbon dioxide. The in-chain modifications were identified by infrared spectroscopy or X-ray photoelectron spectroscopy, and correspond mainly to the formation of carboxylic acids and hydroxyls, along with, more surprisingly, alkenes. By GC-MS or thermodesorption analyses, molecules trapped in the polymer matrixes are esters, carboxylic acids, alcohols, an aromatic molecule and oligomers.
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Submitted on : Friday, December 20, 2019 - 4:20:08 PM
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E. Fromentin, C. Aymes-Chodur, D. Doizi, M. Cornaton, F. Miserque, et al.. On the radio-oxidation, at high doses, of an industrial polyesterurethane and its pure resin. unknown, 2017, ⟨10.1016/j.polymdegradstab.2017.10.007⟩. ⟨cea-02421733⟩



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