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Sorption isotherms of thermally modified wood
-
Wiesław Olek
,
Jerzy Majka
Published/Copyright:
June 17, 2012
Abstract
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.
Keywords: European beech (Fagus sylvatica L.); heat treatment; hygroscopic properties; modeling of sorption isotherms; poplar (Populus spp.)
Received: 2011-12-17
Accepted: 2012-8-9
Published Online: 2012-06-17
Published in Print: 2013-02-01
©2013 by Walter de Gruyter Berlin Boston
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Keywords for this article
European beech (Fagus sylvatica L.);
heat treatment;
hygroscopic properties;
modeling of sorption isotherms;
poplar (Populus spp.)
Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Behavior of xylans from Eucalyptus species. Part 1. The influence of structural features of eucalyptus xylans on their retention in kraft pulp
- Behavior of xylans from the Eucalyptus species. Part 2. Characterization of 4-O-methylglucuronoxylans isolated from black liquors of kraft pulping of Eucalyptus grandis and E. urophylla
- Convenient preparation of a β-O-4-type lignin model trimer via KOH-catalyzed hydroxymethylation and a new protection method
- Topochemistry of heat-treated and N-methylol melamine-modified wood of koto (Pterygota macrocarpa K. Schum.) and limba (Terminalia superba Engl. et. Diels)
- Enzymatic bleaching of eucalyptus kraft pulp: effects on the prebleaching filtrate, pulp quality and paper properties
- Compressive-torsion DMA of yellow-poplar wood in organic media
- Physiomechanical properties of ultra-lightweight foam core particleboard: different core densities
- Fractal dimension analysis of void size in wood-strand composites based on X-ray computer tomography images
- Sorption isotherms of thermally modified wood
- Hot water extracted wood fiber for production of wood plastic composites (WPCs)
- Generic failure mechanisms in adhesive bonds
- Climate response of cell characteristics in tree rings of Picea crassifolia
- Performance of wood treated with prospective organic surface protectants upon outdoor exposure: FTIR spectroscopic analysis of weathered surfaces
- Short Notes
- Studying thermal conductivity of wood at cell wall level by scanning thermal microscopy (SThM)
- Beech wood shrinkage observed at the micro-scale by a time series of X-ray computed tomographs (μXCT)
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