Résines polyépoxydes nanostructurées aux propriétés d’adhésion et à la tenue au vieillissement améliorées

Abstract : The research of innovations to improve the performance of structural bonded-joints, too much sensible to humid aging, is an academic key-lock with a huge impact on technologies. This thesis have been proposed within the scope of the development of new epoxy resins able to resist to aging in humid condition. Diffusion of water is responsible of the decrease of mechanical properties and the loss of adhesion properties in many structural assemblies. In this kind of hydrophilic networks, water can be free or linked by one or several hydrogen bonds. We prove that the chemical and mechanical degradations depend on aging conditions (temperature and humidity level). The diffusion kinetics and the final amount of absorbed water is also strongly dependant on the chemical nature of epoxy resin.The second part of this work deals with the development of new epoxy resins formulations allowing the improvement of durability thanks to the incorporation of blocks copolymers, such as POE-POP-POE triblocks copolymers. Their capacity to self-organize allows the creation of nanodomains capable to establish interactions with water molecules, acting as nano-tanks. The presence of water in nano-domains tends to limit the degradation of mechanical properties of the epoxy matrix. Aging of nanostructured epoxy resins emphasize considerable improvements on durability with conservation of mechanical properties.
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Frédéric Piasecki. Résines polyépoxydes nanostructurées aux propriétés d’adhésion et à la tenue au vieillissement améliorées. Autre. Université Sciences et Technologies - Bordeaux I, 2013. Français. ⟨NNT : 2013BOR14945⟩. ⟨tel-00946530⟩

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