Open Access

ARTICLE

Influence of Water and Humidity on Wood Modification with Lactic Acid

by

1 Department of Architecture, Wood and Civil Engineering, Bern University of Applied Sciences, Solothurnstrasse 102, Postfach 6096, CH-2500, Biel, Switzerland
2 LERMaB, EA 4370, University of Lorraine, Faculty of Science and Technology, BP 70 239, F-54506 Vandoeuvre-lès-Nancy, France
3 CIRAD, UR BIOWooEB, TA B 114/16, 73 rue Jean François Breton, 34398 Montpellier cedex 5, France
4 Department of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, 16300, Espoo, Finland

*Corresponding author:

Journal of Renewable Materials 2018, 6(3), 259-269. https://doi.org/10.7569/JRM.2017.634176

Abstract

Impregnation of dry wood with pure lactic acid oligomers (OLAs) followed by heat treatment confers promising properties to wood because of OLA's good diffusion, in-situ polymerization and persistence in cell walls. Treatment provides drastic reduction of the equilibrium moisture content, high dimensional stability and good durability. The presence of water during treatment has been evaluated. Curing of OLA impregnated dry wood in humid atmosphere leads to a strong and global degradation of the material. OLA treatment of wet wood only impacts the water leaching rate negatively. Treatment of dry wood with OLA diluted in water additionally decreases the biological resistance and is not efficient for decreasing hygroscopicity. Treatment of dry wood with lactic acid solution leads to a lower polymerization level but confers good properties.

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Keywords

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