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Etude de nouveaux traitements de protection du bois à base de polyglycérols

Abstract : Wood is an heterogeneous material composed of tissue of vegetable origin. It is constituted of lignin, cellulose and hemicelluloses. Anisotropic and hygroscopic, it is sensitive to biotic and abiotic attacks, and requires the use of chemical treatments to be stabilized and preserved. However, the toxicity of certain products currently used, associated to the environmental constraints on greenhouse gases, justifies the search for new alternatives for wood preservation. Thus, the work undertaken during this research concerns the use of polyglycerol derivatives as wood dimensional stabilizing agents. Former studies have showed that polyglycerols (PG), soluble in water, increase wood dimensional stability, but are easily leached. To solve this problem, several solutions were developed. The first solution consists in the use of fatty esters of PG with low solubility in water. The results obtained depend on the solvent chosen for impregnation. Treatments in the form of microemulsion lead to better results of dimensional stabilization compared to treatments in organic phase. Moreover the hydrophobic character conferred to wood limits the virulence of rot fungi. A second approach consists in the use of polyglycerol methacrylate, easily obtained from polyglycerol and glycidol methacrylate. Water-borne treatment of wood leads, after drying, to the formation of a polymer insoluble in water able to improve dimensional stability of wood but also its resistance to the basidiomycetes. A microscopic study has allowed the localisation of the product in the wood cells wall, explaining the good dimensional stability observed. Lastly, the third approach considered relates to the formation of a polymeric network in wood obtained from PG, glyoxal and boric acid. Such a combination allows to stabilize wood dimensionally , to limit the depletion of boron compared to boric acid used alone and protect wood against fungi.
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Submitted on : Thursday, March 29, 2018 - 10:42:46 AM
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Patrice Soulounganga. Etude de nouveaux traitements de protection du bois à base de polyglycérols. Autre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10032⟩. ⟨tel-01746690⟩



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