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Moisture adsorption isotherms of Acacia Mangium and Endospermum Malaccense using dynamic vapour sorption.

Zaihan, Jalaludin, Hill, Callum A S, Curling, Simon, Hashim, W S and Hamdan, Hussein (2008) Moisture adsorption isotherms of Acacia Mangium and Endospermum Malaccense using dynamic vapour sorption. Journal of Tropical Forest Science, 21 (3). pp. 277-285. ISSN 0128-1283

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    Abstract/Description

    Moisture adsorption isotherms of Acacia mangium and sesenduk using dynamic vapour sorption. 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), 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 has the lowest hygroscopicity at 7.5% due to bulking of the cell wall with acetyl. The hysteresis of Accoya also exhibited the lowest value between the adsorption and desorption isotherms. Data were analyzed 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.

    Item Type: Article
    Print ISSN: 0128-1283
    Additional Information: The first author is grateful to the Ministry of Natural Resources and Environment Malaysia for the study scholarship and to colleagues at Napier University Edinburgh and Forest Research Institute Malaysia for their support
    Uncontrolled Keywords: Desorption; hygroscopicity hysteresis; water vapour; Hailwood–Horrobin model; DVS;
    University Divisions/Research Centres: Faculty of Engineering, Computing and Creative Industries > School of Engineering and the Built Environment
    Dewey Decimal Subjects: 600 Technology > 620 Engineering > 624 Civil engineering
    500 Science > 580 Plants (Botany) > 582 Plants noted for characteristics & flowers > 582.16 Trees
    600 Technology > 670 Manufacturing > 674 Lumber processing, wood products & cork
    Library of Congress Subjects: Q Science > QK Botany
    T Technology > TA Engineering (General). Civil engineering (General)
    Item ID: 3585
    Depositing User: Professor Callum Hill
    Date Deposited: 03 Dec 2009 11:24
    Last Modified: 09 Oct 2014 16:54
    URI: http://researchrepository.napier.ac.uk/id/eprint/3585

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