Moisture adsorption isotherms of wood studies using a dynamic vapour sorption apparatus

IRG/WP 09-20398

J Zaihan, C A S Hill, S Curling

Five types of wood including two Malaysian hardwoods acacia mangium (Acacia mangium) and sesenduk (Endospermum malaccense), two temperate softwoods, Sitka spruce (Picea sitchensis), radiata pine (Pinus radiata) and Accoya (commercially modified wood) were studied to determine their moisture sorption behaviour using a Dynamic Vapour Sorption (DVS) apparatus. The isotherm plot for each species tested showed differences in the adsorption and desorption behaviour. The modified wood Accoya had the lowest Equilibrium moisture content (EMC). The hysteresis of Accoya also exhibited the lowest value between the adsorption and desorption isotherms. The data was also analyzed using the Hailwood-Horrobin (HH) model for isotherm fitting and determination of monolayer and polylayer moisture content. Comparison on the number of accessible OH groups in the monolayer as determined by the HH theory did not correspond with that determined using Rowell’s method for any of the samples.

Keywords: adsorption, hysteresis, water vapor, Hailwood Horrobin model, dvs

Conference: 09-05-24/28 Beijing, China

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