Moisture adsorption isotherms of Acacia mangium and Endospermum malaccense using dynamic vapour sorption

Hashim W. S., . and Hill C. A. S., . and H. Hamdan, . and Zaihan J., . and Curling S., . Moisture adsorption isotherms of Acacia mangium and Endospermum malaccense using dynamic vapour sorption. pp. 277-285. ISSN 0128-1283

Two Malaysian hardwoods namely acacia (Acacia mangium) and sesenduk (Endospermum malaccense) were studied to determine their moisture sorption behaviour using a dynamic vapour sorption (DVS) apparatus. For comparison two temperate softwoods Sitka spruce (Picea sitchensis) and radiata pine (Pinus radiata) and one commercially modified wood Accoya (radiata pine that is chemically modified with acetic anhydride) were tested with the same DVS. The sigmoid isotherm plot for each of the wood tested showed differences in the adsorption and desorption plots. At 90 relative humidity (RH) acacia and sesenduk had lower hygroscopicity (16.2 and 17.9 respectively) compared with radiata pine (18) and Sitka spruce (20.1). The modified Accoya had the lowest hygroscopicity (7.5) due to bulking of the cell wall with acetyl. Hysteresis of Accoya also exhibited the lowest value between the adsorption and desorption isotherms. Data were analysed using the Hailwood“Horrobin (HH) model for isotherm fitting and determination of monolayer and polylayer moisture content. The OH group concentration in the HH monolayer did not correspond to the total accessible OH group derived by calculation based on the chemical composition of each of the wood species.

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Abstract

Two Malaysian hardwoods namely acacia (Acacia mangium) and sesenduk (Endospermum malaccense) were studied to determine their moisture sorption behaviour using a dynamic vapour sorption (DVS) apparatus. For comparison two temperate softwoods Sitka spruce (Picea sitchensis) and radiata pine (Pinus radiata) and one commercially modified wood Accoya (radiata pine that is chemically modified with acetic anhydride) were tested with the same DVS. The sigmoid isotherm plot for each of the wood tested showed differences in the adsorption and desorption plots. At 90 relative humidity (RH) acacia and sesenduk had lower hygroscopicity (16.2 and 17.9 respectively) compared with radiata pine (18) and Sitka spruce (20.1). The modified Accoya had the lowest hygroscopicity (7.5) due to bulking of the cell wall with acetyl. Hysteresis of Accoya also exhibited the lowest value between the adsorption and desorption isotherms. Data were analysed using the Hailwood“Horrobin (HH) model for isotherm fitting and determination of monolayer and polylayer moisture content. The OH group concentration in the HH monolayer did not correspond to the total accessible OH group derived by calculation based on the chemical composition of each of the wood species.

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Item Type:	Article
AGROVOC Term:	Acacia mangium
AGROVOC Term:	Hard wood
AGROVOC Term:	Pine (tree)
AGROVOC Term:	Hygroscopicity
AGROVOC Term:	Sitka spruce
AGROVOC Term:	Moisture content
AGROVOC Term:	Chemical composition
AGROVOC Term:	Softwood
AGROVOC Term:	Pinus radiata
AGROVOC Term:	Desorption
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	26 Apr 2025 15:20
URI:	http://webagris.upm.edu.my/id/eprint/21687

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