Evolution des propriétés physico-chimiques et mécaniques de composites à base caoutchoucs lors du photo-vieillissement

Abstract : Rubbers or mostly polymers are exposed to different attacks from the surroundings during their uses. Two factors are known to be among the most important involved during aging: atmospheric oxygen and UV-visible radiation from the sun, leading to the phenomenon of photo-oxidation. Photo-ageing is governed by the light penetration and diffusion of oxygen, which involve the formation of an oxidative layer on the first microns at the surface of the material. The main objective of this thesis is to point out the relationship between the changes in the chemical structure due to the formation of the oxidative layer and the loss of mechanical properties during photo-aging of vulcanised rubber in the presence of fillers such as titanium dioxide and organic dye by means of a multi-techniques and multi-scale approach.To achieve this goal, we first simplified the vulcanized material and we focused only on the matrix and fillers. This first step allowed us to determine the influence of fillers on the mechanisms of photo-oxidation of unvulcanised rubber. This study helped to better understand more complex materials such as vulcanised rubbers. In the second study, we focused on the physic-chemical characterization of the degraded layer formed during irradiation of vulcanised rubber. After that, we compared the results with the loss of the mechanical properties observed during aging. This study highlighted a link between the changes of the chemical structure related to the properties of the oxidized layer and the loss of the mechanical properties.
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Grégory Mertz. Evolution des propriétés physico-chimiques et mécaniques de composites à base caoutchoucs lors du photo-vieillissement. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL074N⟩. ⟨tel-01749520⟩

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