Liquéfaction d'écorces en vue de leur valorisation pour le développemnt de nouveaux produits de traitement du bois

Abstract : This work focuses on the use of liquefaction products of spruce bark in phenol for the wood preservation. The liquefaction products allow the synthesis of phenolic thermosetting resins. The formulated resins were impregnated into the wood followed by in situ polymerization. A pretreatment was developed in order to increase the phenolic compounds in the spruce bark. This step is an acid hydrolysis of polysaccharides. This pretreatment allowed obtaining a Klason lignin content of 60 %, and a cellulose content of 28 %. A liquefaction process was developed in a mixture of solvent composed of phenol, ethanol, and water. The optimized experimental conditions allowed obtaining a liquefaction yield superior to 85 %, with liqui?ed bark/phenol ratio superior to 50 %. The lique?ed products had the advantage to polymerize without formaldehyde. The resins enhanced the wood durability especially for the phenol/formaldehyde resins. The leaching was low. The wood impregnation allowed a wood swelling, thereby the impregnated wood had a better dimensional stability
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Xavier Duret. Liquéfaction d'écorces en vue de leur valorisation pour le développemnt de nouveaux produits de traitement du bois. Autre. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0032⟩. ⟨tel-01749563⟩

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