A rheological description of the water vapour sorption kinetics behaviour of wood invoking a model using a canonical assembly of Kelvin-Voigt elements and a possible link with sorption hysteresis
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Callum A.S. Hill
,
Barbara A. Keating
Abstract
The dynamic vapour sorption behaviour of two Malaysian hardwoods, acacia (Acacia mangium Wild) and sesendok (Endospermum malaccense Bent ex Müll. Arg.) was studied over a narrow temperature range (20–40°C). The rate of sorption or desorption of water into or out of the wood cell wall was considered to be limited by the viscoelastic behaviour of the material and the sorption kinetics was accordingly analysed in terms of a canonical series of Kelvin-Voigt elements. A two series and three series model have been applied to the kinetic data and the results are compared. Characteristic times and moisture contents were obtained from the models. The Arrhenius equation was used in conjunction with the reciprocals of the characteristic times to calculate the activation energy and activation entropy of sorption, and the Gibbs free energy of activation for the sorption process was also determined. This is the first time that entropy of activation and Gibbs free energy of activation for sorption processes with wood have been reported. Interpretation of these data invokes a model describing the polymeric relaxation processes occurring within the cell wall during adsorption or desorption. A possible link between sorption kinetics, polymeric relaxation processes, and sorption hysteresis is discussed.
©2012 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Original Papers
- Novel paper sizing agents based on renewables. Part 5: characterization of maleated oleates by ozonolysis
- Polythiophene-cellulose composites: synthesis, optical properties and homogeneous oxidative co-polymerization
- The influence of extended mercerization on some properties of carboxymethyl cellulose (CMC)
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- A rheological description of the water vapour sorption kinetics behaviour of wood invoking a model using a canonical assembly of Kelvin-Voigt elements and a possible link with sorption hysteresis
- Changes in chemistry, color, dimensional stability and fungal resistance of Pinus radiata D. Don wood with oil heat-treatment
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- Synthesis and properties of resol-type phenol-formaldehyde resins prepared from H2SO4- and HCl-catalyzed phenol-liquefied Cryptomeria japonica wood
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- Properties of thermally modified medium-density fibreboards
- Carbonaceous structural changes of wood induced by microwave irradiation
- Development of DNA-based methods to identify CITES-protected timber species: a case study in the Meliaceae family
- Fungal biodegradation of genetically modified and lignin-altered quaking aspen (Populus tremuloides Michx.)
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- Cellular and topochemical characteristics of secondary changes in bark tissues of beech (Fagus sylvatica)
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- A study by X-ray photoelectron spectroscopy (XPS) of the chemistry of the surface of Scots pine (Pinus sylvestris L.) modified by friction
- Comparative termite resistance of 12 Malaysian timber species in laboratory tests
- Meetings
- 10.1515/HF.2011.185
