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L. and X. Giganteus, Le MxG ayant servi à ce travail provient du lycée agricole à Courcelles-Chaussy Sa teneur élevée en hémicelluloses (26 %), en lignine (26 %) et en cellulose (36 %) en fait une bonne source de polymères et de carburant renouvelable. L'étude que nous avons réalisée a été menée dans le but de caractériser la paille de MxG et d'optimiser le processus de délignification en une seule étape (1) par un traitement organosolv à l'éthanol et en deux étapes (2) par un prétraitement consistant en une autohydrolyse à l'eau/organosolv. Le procédé éthanol organosolv a permis un bon fractionnement des trois constituants de la biomasse (la lignine, la cellulose et les hémicelluloses) Le procédé de traitement en deux étapes, impliquant une autohydrolyse à l'eau (en présence et en l'absence du 2-naphtol), préalable au traitement organosolv, a permis de faciliter l'étape ultérieure de délignification en déstructurant la lignine. Une investigation portant sur la structure physico-chimique a été réalisée sur de la lignine de bois broyé et de la lignine organosolv de MxG extraite à différentes sévérités de traitement. Nous nous sommes ensuite intéressés à utiliser la lignine organosolv pour la formulation d'un adhésif pour le bois dans laquelle un aldéhyde non toxique et peu volatile (le glyoxal) est employé en remplacement du formaldéhyde. Une formulation, composée à 100 % de résines naturelles (60 % de tannins de mimosa et 40 % de lignine glyoxalée) a été utilisée pour la conception d'un panneau de particules et a donné des résultats prometteurs avec une force de liaison interne de 0, p.41