Modification de la structure chimique du bois : méthodologie de synthèse et recherche de nouvelles propriétés biologiques ou physico-chimiques

Abstract : The purpose of this study is the elaboration of new chemical modifications of the wood structure in order to obtain new physico-chemical and biological properties. In the first part, blocks of beech wood were impregnated with mixture of functionnalized polyethylene glycol / copper sulfate.The effects several parameters on the retention of chemicals and the biological protection are discussed (leaching, pH, concentrat.ion of the treatment bath and end-group of the polyether). It is also found for exemple that an equimolar mixture (8,33.10- ³ mole/l) of polyethylene glycol (600) diacid and of copper sulfate preserves wood from the attack of Coriolus versicolor. In the second part, different grafting metbods of chemicals on wood are presented. A new method, using acyl azides, less taxiC and more stable than isocyanates, is described. The intermediate isocyanate, obtained by Curtius rearrangement of the acyl azide, reacts with wood in the presence of a catalyst. Aromatic groupe, PEG or fatty alkyl chains are grafted by this way on spruce sawdust. Treatment,of beech blocks with a mixture of fatty acyl azides, obtained from animal greases, improves their dimensionnaI stability (ASE =45 %). The last part is devoted to the study of the ability of modified sawdusts for the removal of metallic ions or greases from water. Interesting results are obtained in this area.
Document type :
Theses
File URL :
http://docnum.univ-lorraine.fr/prive/SCD_T_1996_0208_MAURIN.pdf
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https://hal.univ-lorraine.fr/tel-01747226
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Submitted on : Thursday, March 29, 2018 - 10:55:16 AM
Last modification on : Friday, March 30, 2018 - 1:32:25 AM

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  • HAL Id : tel-01747226, version 1

Citation

Emmanuel Maurin. Modification de la structure chimique du bois : méthodologie de synthèse et recherche de nouvelles propriétés biologiques ou physico-chimiques. Autre. Université Henri Poincaré - Nancy 1, 1996. Français. ⟨NNT : 1996NAN10208⟩. ⟨tel-01747226⟩

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