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Chemical modification of wood by mixed anhydrides

Peydecastaing, Jérôme. Chemical modification of wood by mixed anhydrides. PhD, Institut National Polytechnique de Toulouse, 2008

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Official URL: http://ethesis.inp-toulouse.fr/archive/00001271/

Abstract

The chemical modification of wood with mixed anhydrides with aim to improve its properties has been investigated. Unsymmetrical acetic-fatty anhydrides were obtained after reaction between acetic anhydride and a fatty acid and two consecutive equilibrated reactions were put in evidence, yielding at equilibrium also a fatty anhydride in low proportion. Cellulose and Scots pine sawdust were treated by mixed anhydride mixtures and yielded lowly substituted mixed esters with different acetyl/fatty acyl ratios. The hydrophobicity of the esters, measured by water vapor sorption, was correlated to the total DS whereas the contact angle depended only on the fatty acyl substitution and was reached even at very low degree of substitution (DS=3.10-4). The treatment of wood blocks resulted in high dimensional stability (Anti-swelling efficiency ASE of 90%) and depended on the total grafting whatever was the acyl group grafted. Mechanical properties of the treated wood were found to be preserved

Item Type:PhD Thesis
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Laboratory name:
Research Director:
Borredon, Elisabeth and Vaca Garcia, Carlos
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