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Changes in wood-water relationship due to heat treatment assessed on micro-samples of three Eucalyptus species
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Giana Almeida
Veröffentlicht/Copyright:
10. November 2008
Abstract
Wood-water relationship of untreated and heat-treated wood was studied. Specimens of Eucalyptusgrandis, E. saligna, and E. citriodora were submitted to five conditions of heat treatment: 180°C and 220°C with air; 220°C, 250°C, and 280°C with N2. The wood-water relationships were accurately studied in a special device, in which the moisture content (MC) of the sample was measured with a highly sensitive electronic microbalance placed in a climatic chamber. The dimensions of the sample were collected continuously without contact by means of two high-speed laser scan micrometers. Sorption curves and shrinkage-MC relationships were observed. To study the effects of heat treatment, the following parameters were also determined: fiber saturation point (FPS), wood anisotropy (T/R ratio), shrinkage slope, reduction in hygroscopicity, and anti-shrink efficiency (ASE). The physical properties were significantly affected only at 220°C and above. At heat temperature levels higher than 220°C, the reduction in hygroscopicity and ASE are higher than 40% and continue to be reduced with increasing temperature level. This work also demonstrates that heat treatment does not change the slope of the curves “shrinkage vs. MC”, proving that heat treatment affects the domain of alterations in wood properties, but not the behavior within this domain.
Keywords: Eucalyptus citriodora; Eucalyptus grandis; Eucalyptus saligna; fiber saturation point (FSP); heat treatment; shrinkage; sorption
Received: 2008-5-22
Accepted: 2008-9-1
Published Online: 2008-11-10
Published Online: 2008-11-10
Published in Print: 2009-01-01
©2009 by Walter de Gruyter Berlin New York
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Schlagwörter für diesen Artikel
Eucalyptus citriodora;
Eucalyptus grandis;
Eucalyptus saligna;
fiber saturation point (FSP);
heat treatment;
shrinkage;
sorption
Artikel in diesem Heft
- Editorial
- A report from the 2nd International Cellulose Conference (ICC 2007) in Tokyo
- Selected articles from the 2nd International Cellulose Conference (ICC 2007) in Tokyo
- Cellulosic aerogels as ultra-lightweight materials. Part 2: Synthesis and properties 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Oxidative modifications of cellulose in the periodate system – Reduction and beta-elimination reactions 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- A comparative study of bamboo Lyocell fiber and other regenerated cellulose fibers 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Formation of the crystal structure of Lyocell fiber during drying 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Adhesion to wet cellulose – Comparing adhesive layer-by-layer assembly to coating polyelectrolyte complex suspensions 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Antimicrobial activity of polyelectrolyte multilayer-treated cellulose films 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Cellulose supramolecular structure changes during chemical activation and sulfation 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Action of fungal β-glucosidase on the mono-O-methylated p-nitrophenyl β-d-glucopyranoside 2nd ICC 2007, Tokyo, Japan, October 25–29, 2007
- Original Papers
- Investigation of hydrogen abstraction from methyl glucoside by active oxygen species under oxygen delignification conditions. Part 1: Study on the anomeric position
- Hydrolytic stability of water-soluble spruce O-acetyl galactoglucomannans
- Cloning and characterization of α-pinene synthase from Chamaecyparis formosensis Matsum
- Gadolinium chloride as a contrast agent for imaging wood composite components by magnetic resonance
- Changes in wood-water relationship due to heat treatment assessed on micro-samples of three Eucalyptus species
- Modification of Fagus sylvatica L. with 1,3-dimethylol-4,5-dihydroxy ethylene urea (DMDHEU). Part 2: Pore size distribution determined by differential scanning calorimetry
- Alteration of the pore structure of spruce (Picea abies (L.) Karst.) and maple (Acer pseudoplatanus L.) due to thermal treatment as determined by helium pycnometry and mercury intrusion porosimetry
- Data reduction scheme for measuring GIIc of wood in end-notched flexure (ENF) tests
- Acoustic wood tomography on trees and the challenge of wood heterogeneity
- Horizontal transfer of boron by the Formosan subterranean termite (Coptotermes formosanus Shiraki) after feedingon treated wood
- Meeting
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