Journal
HOLZFORSCHUNG
Volume 67, Issue 2, Pages 183-191Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/hf-2011-0260
Keywords
European beech (Fagus sylvatica L.); heat treatment; hygroscopic properties; modeling of sorption isotherms; poplar (Populus spp.)
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Funding
- Ministry of Science and Higher Education [N N309 2876 3]
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The hygroscopic properties of thermally modified wood have been studied in terms of adsorption and desorption processes. Poplar (Populus spp.) and European beech (Fagus sylvatica L.) were in focus. The obtained isotherms were parameterized with the models of Hailwood-Horrobin, Guggenheim-Anderson-deBoer, generalized D'Arcy and Watt, and Yanniotis and Blahovec. The changes in equilibrium moisture content (EMC) were quantified, and the accessibility of water vapor to the sorption sites was determined. The monolayer and multilayer sorption was studied and the sorption isotherms were classified. All sorption isotherms were type II, and the type was not changed after the modification. The monolayer sorption was found to be responsible for the reduction in EMC after thermal modification. The observed increase in the hysteresis coefficient was explained by the reorganization of the wood ultrastructure.
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