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Moisture Adsorption Isotherms Of Acacia Mangium And Endospermum Malaccense Using Dynamic Vapour Sorption

Zaihan J., and Hill, C.A.S., and Curling, S., and Hashim W.S. , and Hamdan H., (2009) 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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Official URL: http://info.frim.gov.my/cfdocs/infocenter/jtfsonline/jtfs/v21n3/277-285.pdf

Affiliations

Edinburgh Napier University, Centre for Timber Engineering, School of Engineering and the Built Environment,
Edinburgh Napier University, Centre for Timber Engineering, School of Engineering and the Built Environment
Edinburgh Napier University, Centre for Timber Engineering, School of Engineering and the Built Environment
Forest Research Institute Malaysia
Forest Research Institute Malaysia

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.

Dua kayu keras Malaysia iaitu akasia (Acacia mangium) dan sesenduk (Endospermum malaccense) dikaji sifat erapan lembapan menggunakan alat erapan wap dinamik (DVS). Sebagai perbandingan dua kayu lembut iklim sederhana, sprus Sitka (Picea sitchensis) dan pain radiata (Pinus radiata), dan satu kayu yang diubah suai secara komersial yang dinamai Accoya (pain radiata yang diubah suai secara kimia menggunakan asetik anhidrida) telah diuji dengan alat DVS yang sama. Plot isoterma berbentuk sigmoid bagi setiap spesies kayu yang diuji menunjukkan perbezaan lengkungan penjerapan dan penyaherapan. Pada kelembapan relatif 90%, akasia dan sesenduk mempunyai kehigroskopikan yang lebih rendah (masing-masing 16.2% dan 17.9%) berbanding pain radiata (18%) dan sprus Sitka (20.1%). Kayu yang telah diubah suai iaitu Accoya menunjukkan sifat kehigroskopikan yang paling rendah iaitu 7.5% disebabkan dinding selnya telah dipenuhi oleh bahan asetil. Bagi sifat histeresis pula Accoya jelas menunjukkan perbezaan terendah antara isoterma penjerapan dengan penyaherapan. Data DVS ini juga dianalisis menggunakan model Hailwood–Horrobin untuk penetapan isoterma dan penentuan kandungan air lapisan mono dan lapisan poli. Kumpulan OH yang dihasilkan daripada lapisan mono model ini tidak sama dengan jumlah kumpulan OH yang dihasilkan daripada pengiraan berdasarkan komposisi kimia setiap spesies kayu.

Item Type:Journal
Additional Information:The first author is grateful to the Ministry of Natural Resources and Environment Malaysia for the study cholarship and to colleagues at Napier University Edinburgh and Forest Research Institute Malaysia for their support.
Keywords:Desorption, hygroscopicity hysteresis, water vapour, Hailwood–Horrobin model, DVS
Subjects:S Agriculture, Forestry
ID Code:8551

Araque E, Parra C, Freer J, Contreras D, Rodriguez J, Mendoca R & Baeza J. 2008. Evaluation of organosolv pre-treatment for the conversion of Pinus radiata D. Don to ethanol. Enzyme and Microbial Technology 43:214−219.

Chen CM & Wangaa rd F. 1968. Wettability and hysteresis effect in the sorption of water vapor by wood. Wood Science Technology 2: 177−187.

Fengel D & Wegener G. 1989. Wood-Chemistry Ultrastructure Reactions. Walter de Gruyter, Berlin.

Hailwood AJ & Horrobin S. 1946. Absorption of water by polymers analysis in terms of a simple model. Transactions of the Faraday Society 42: 84−102.

Hill CAS. 2006. Wood Modification Chemical, Thermal and Other Processes. John Wiley & Sons, Chichester.

Hill CAS. 2008. The reduction in the fibre saturation point of wood due to chemical modification using anhydride reagents: a reappraisal. Holzforshung 62:423−428.

Hill Cas, Norton A & Newma n G. 2009. The water vapor sorption behavior of natural fibers. Journal of Applied Polymer Science 112: 1524–1537.

Mohd Nor MY. 1991. Effect of pulping properties on the sizing of paper from Acacia mangium pulp. PhD thesis, University of Manchester, Manchester.

Okoh KIA & Skaar C. 1980. Moisture sorption isotherms of the wood and inner bark of ten southern US hardwoods. Wood Fiber Science 12: 98−111.

Papadopoulos AN & Hill CAS. 2003. The sorption of water vapor by anhydride modified softwood. Wood Science Technology 37: 221−231.

Rowell R. 1980. Distribution of reacted chemicals in southern pine modified with methyl isocyanate. Wood Science 13: 102−110.

Rushdan I, Mahmuddin S, Sharmiza A, Latifah J, Mohd Nor MY & Ainun ZM. 2007. Pulping of Endospermum malaccense thinnings from a forest plantation. Pp. 395−406 in Proceedings of Conference Forestr y and Forest Products Research. 27−28 November 2007, Kuala Lumpur. Forest Research Institute Malaysia, Kepong.

Siau JF. 1984. Transport Processes in Wood. Springer-Verlag, Berlin.

Simpson W. 1980. Sorption theories applied to wood. Wood Fiber Science 12: 135−195.

Skaar C. 1972. Water in Wood. Syracuse University Press, New York.

Skaar C. 1988. Wood–Water Relationship. Springer-Verlag,

Berlin.

Spalt HA. 1958. The fundamentals of water vapor sorption by wood. Forest Products Journal 8: 288−295.

Stamm AJ. 1952. Surface properties of cellulosic materials. Pp. 696−814 in Wise LE & Jahn EC (Eds.) Wood Chemistry, Volume II. American. Chemistry Society Part IV. Second edition. Reinhold Publishing Corporation, New York.

Stamm AJ. 1971. Review of nine methods for determining the fiber saturation point of wood and wood products. Wood Science 4: 114−127

Sumi Y, Hale RD, Meyer JA, Leopold B & Ranby BG. 1964. Accessibility of wood and wood carbohydrates measured with triatiated water. Tappi 47: 621−624.

Taniguchi T, Harada H & Nakato K. 1978. Determination of water adsorption sites in wood by a hydrogendeuterium exchange. Nature 272: 230−231.

Tiemann D. 1906. Effect of Moisture Upon the Strength and Stiffness of Wood. USDA Forest Service Bulletin 70,ashington DC.

Wangaard FF & Granados LA. 1967. The effect of extractives on water-vapor sorption of wood. Wood Science

Technology 1: 253−277.

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