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Polymères sous rayonnements ionisants : étude des transferts d'énergie vers les défauts d'irradiation

Aude Ventura 1 
1 MADIR - Matériaux, Défauts et IRradiations
CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
Abstract : Radiation-induced defects created in polymers submitted to ionizing radiations, under inert atmosphere, present the same trend as a function of the dose. When the absorbed dose increases, their concentrations increase then level off. This behavior can be assigned to energy transfers from the polymer to the previously created macromolecular defects; the latter acting as energy sinks. During this thesis, we aimed to specify the influence of a given defect, namely the trans-vinylene, in the behavior of polyethylene under ionizing radiations. For this purpose, we proposed a new methodology based on the specific insertion, at various concentrations, of trans-vinylene groups in the polyethylene backbone through chemical synthesis. This enables to get rid of the variety of created defects on one hand and on the simultaneity of their creation on the other hand. Modified polyethylenes, containing solely trans-vinylene as odd groups, were irradiated under inert atmosphere, using either low LET beams (gamma, beta) or high LET beams (swift heavy ions). During irradiations, both macromolecular defects and H2 emission were quantified. According to experimental results, among all defects, the influence of the trans-vinylene on the behavior of polyethylene is predominant.
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Submitted on : Monday, February 24, 2014 - 10:39:47 PM
Last modification on : Saturday, June 25, 2022 - 9:47:39 AM
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  • HAL Id : tel-00950232, version 1


Aude Ventura. Polymères sous rayonnements ionisants : étude des transferts d'énergie vers les défauts d'irradiation. Matière Molle [cond-mat.soft]. Université de Caen, 2013. Français. ⟨NNT : ⟩. ⟨tel-00950232⟩



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