Journal
WOOD MATERIAL SCIENCE & ENGINEERING
Volume 5, Issue 3-4, Pages 194-203Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/17480272.2010.503940
Keywords
Dynamic vapour sorption; Hailwood-Horrobin; hysteresis ratio; isotherm; thermal wood; water vapour sorption
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Funding
- Ministry of Natural Resources and Environment Malaysia
- Scottish Funding Council
- Joint Research Institute for Civil and Environmental Engineering of the Edinburgh Research Partnership
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Two Malaysian hardwoods, acacia (Acacia mangium) and sesendok (Endospermum malaccense), that had been subjected to oleo-thermal modification were studied to determine their sorption isotherm behaviour using a dynamic vapour sorption apparatus. All the specimens were thermally modified using palm oil at three different temperatures (180, 200 and 220 degrees C) and three different times (1, 2 and 3 h). The results showed that there was a reduction in equilibrium moisture content at each target relative humidity due to the heat treatment, but that the two wood species showed different behaviour in this respect. The adsorption isotherms were analysed using the Hailwood and Horrobin model, with excellent fits to the experimental data. The monolayer water and polylayer water were both reduced at a range of relative humidity values of the treated samples, although behaviour between the two wood species differed. Heat treatment resulted in an increase in hysteresis ratio, which was probably due to the increase in matrix stiffness of the cell walls.
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