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Influence of chemical treatments on moisture-induced dimensional change and elastic modulus of earlywood and latewood
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Robert J. Moon
Published/Copyright:
September 1, 2010
Abstract
To better understand the performance of bonded, coated, and modified wood, knowledge of how these processes alter the dimensional change and mechanical properties of wood at a given moisture content (MC) are important. These localized influences on earlywood (EW) and latewood (LW) properties are not well understood. In the present study, the influence of chemical treatments by hydroxymethylated resorcinol (HMR) and acetylation on moisture-induced dimensional change and longitudinal modulus of elasticity (MOE) of isolated EW and LW specimens of Loblolly pine (Pinus taeda L.) was evaluated. The dimensional change was not altered by the HMR treatment, whereas acetylation lowered it by ∼50% in EW and LW in both radial and tangential directions. The MOE was not influenced by the two chemical treatments tested. Based on results of swelling, shrinkage, and MOE it can be concluded that chemical treatment does not modify EW selectively compared with LW neither in radial nor in tangential orientation.
Keywords: acetylation; earlywood; dimension change; hydroxymethylated resorcinol; latewood; loblolly pine; micromechanics; modulus of elasticity; shrinking; swelling
Received: 2010-1-23
Accepted: 2010-5-19
Published Online: 2010-09-01
Published Online: 2010-09-1
Published in Print: 2010-10-01
©2010 by Walter de Gruyter Berlin New York
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- Short note
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- Meetings
- Meetings
- Acknowledgement
- Acknowledgement
Keywords for this article
acetylation;
earlywood;
dimension change;
hydroxymethylated resorcinol;
latewood;
loblolly pine;
micromechanics;
modulus of elasticity;
shrinking;
swelling
Articles in the same Issue
- Original papers
- Galactoglucomannan stabilization during the initial kraft cooking of Scots pine
- A CP/MAS 13C-NMR study of cellulose fibril aggregation in eucalyptus dissolving pulps during drying and the correlation between aggregate dimensions and chemical reactivity
- Characteristics and discrimination of five types of wood-plastic composites by FTIR spectroscopy combined with principal component analysis
- Macro- and micromechanical characterization of wood-adhesive bonds exposed to alternating climate conditions
- Viscoelasticity of aspen wood strands during hot pressing: Experimentation and modeling
- Applying digital image correlation to wood strands: Influence of loading rate and specimen thickness
- Influence of loading conditions on the measurement of mode I critical stress intensity factor for wood and medium-density fiberboard by the single-edge-notched tension test
- Advancing the dynamic mechanical analysis of biomass: comparison of tensile-torsion and compressive-torsion wood DMA
- Improvement of water resistance and dimensional stability of wood through titanium dioxide coating
- Analysis of water vapour sorption of oleo-thermal modified wood of Acacia mangium and Endospermum malaccense by a parallel exponential kinetics model and according to the Hailwood-Horrobin model
- Influence of chemical treatments on moisture-induced dimensional change and elastic modulus of earlywood and latewood
- Measurement of internal stress in Radiata pine sapwood during drying using an improved online sensor
- Mechanical potential of eco-OSB produced from durable and nondurable species and natural resins
- Improvement of glued-in-rod joint system using compressed wooden dowel
- Short note
- On the long-term visco-elastic behaviour of polyethylene glycol (PEG) impregnated archaeological oak wood
- Meetings
- Meetings
- Acknowledgement
- Acknowledgement
