Modification chimique des extractibles de bois : application à la protection du bois et des matériaux métalliques

Abstract : Within the framework of this thesis, we are interested in the design, synthesis and characterization of the physicochemical properties of lipophilic derivatives of wood extractives. We have thus considered modifying the structure of three flavonoids whose resource is important from different wood species: catechin, mesquitol and naringenin to incorporate additional functionalities. The applications reported here mainly deal with the protection of materials like wood and corrodible metals. With respect to wood preservation, it seems possible to consider different strategies to inhibit the wood degradation related to fungi on wood. Impregnation of antioxidant compounds such as lipophilic polyphenols on wood can limit the effects of radicals or other oxidants used and generated by rots. The second intended application is the protection of metallic materials. Indeed, the use of natural antioxidants as a corrosion inhibitor replace inorganic inhibitors or organic molecules (polyamines, imidazole...), because their production is expensive and toxic. The grafting of a hydrophobic hydrocarbon chain on polyphenols which have antioxidant properties allows the formation of protective films on the material.
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Wissem Sahmim. Modification chimique des extractibles de bois : application à la protection du bois et des matériaux métalliques. Matériaux. Université de Lorraine; Université de Carthage (Tunisie), 2018. Français. ⟨NNT : 2018LORR0300⟩. ⟨tel-02130216⟩

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