Enhancing water resistance of welded dowel wood joints by acetylated lignin

• Published in: Journal of adhesion science and technology Vol. 27; no. 3; pp. 252 - 262
• Main Authors: Pizzi, A., Zhou, X., Navarrete, P., Segovia, C., Mansouri, H.R., Placentia Pena, M.I., Pichelin, F.
• Format: Journal Article
• Language: English
• Published: Abingdon Routledge 01-02-2013; Taylor & Francis
• Subjects: acetylated lignin; Applied sciences; biosourced additives; Degradation and preservation; ductile behaviour; environment friendly; Exact sciences and technology; interpenetrating network; lignin; Polymer industry, paints, wood; water resistance; waterproofing additives; welded dowels; Wood; wood welding; Wood. Paper. Non wovens; Lignin; ductile behaviour; Welding; water resistance; Oligomer; interpenetrating network; Straw; Additive; Welded joint; acetylated lignin; Chemical composition; Acetylation; Agricultural waste; Chemical properties; environment friendly; Lignin derivatives; wood welding; biosourced additives; welded dowels; Mechanical properties; Hardwood; Tensile property; Experimental study; waterproofing additives; Wood preservative; Chemical modification; Peg; Waterproofness; Cereal; Wheat
• ISSN: 0169-4243; 1568-5616
• DOI: 10.1080/01694243.2012.705512

Low molecular mass acetylated organosolv lignin from wheat straw and from depolymerised low sulphur organosolv wood lignin have been shown to markedly improve both the water resistance and the mechanical performance of welded dowel wood joints. The acetylated oligomers distribution and extent of acetylation of the two lignins were determined by Matrix assisted laser desorption ionization-time-of-flight mass spectrometry. Extensive acetylation was confirmed by CP-MAS
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C NMR spectrometry. Force-displacement measurements on welded dowel joints to which acetylated wood lignins were added showed a ductile behaviour. This is due to the interpenetration of the elastic acetylated lignin network into the more rigid composite network of the welded interphase.