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Procédé de traitement thermique du bois, évolution de la composition chimique et des propriétés macroscopiques : Identification d'un paramètre de contrôle de la durabilité

Abstract : It is generally accepted that thermal treatment of wood by mild pyrolysis improved its durability to fungal degradation. This improvement is generally explained by 4 hypothesis: the low affinity of heat-treated wood to water, the generation of toxic compounds, the chemical modification of the main wood polymers and the degradation of hemicelluloses. ln order to confirm or flot the previous hypothesis, the durability of heat-treated beech wood towards Coriolus versicolor was evaluated according to different parameters like mass, wettability or chemical composition. There was insufficient evidence to support the hypothesis for the generation of fungicidal compounds or for the hydrophobie character. The most plausible hypothesis concerns its chemical modifications. Indeed, degradation of hemicelluloses associated to lignin chemical modifications could be at the origin of improved durability. Moreover the results show a good correlation between the weight loss during the treatment and the fungal durability. From this correlation we propose a quality contrai for the thermal treatment.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_2006_0018_HAKKOU.pdf
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Submitted on : Thursday, March 29, 2018 - 10:41:28 AM
Last modification on : Wednesday, March 11, 2020 - 11:33:17 AM

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  • HAL Id : tel-01746624, version 1

Citation

Mohammed Hakkou. Procédé de traitement thermique du bois, évolution de la composition chimique et des propriétés macroscopiques : Identification d'un paramètre de contrôle de la durabilité. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10018⟩. ⟨tel-01746624⟩

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