Material properties and their interrelation in chemically modified clear wood of Scots pine
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Hannah Epmeier
Abstract
The mechanical and physical properties of modified wood were assessed experimentally. Timber studs with a cross-section of 45 mm×70 mm were modified on a semi-industrial scale by four different methods: 1) acetylation (AC) with acetic anhydride; 2) modification with methylated melamine formaldehyde resin (MMF); 3) heat treatment in vegetable oil (HT); and 4) furfurylation (FA). Sapwood of Scots pine (Pinus sylvestris) with test specimen dimensions of 10×10×200 mm3 was investigated. A total of 2449 specimens were included in the study. The following properties and their correlations were studied: density, modulus of elasticity (MOEdyn) measured dynamically, equilibrium moisture content (EMC), and swelling behaviour. The properties were measured at humidity levels of 30%, 65%, and 90% RH, while the temperature was kept constant at 23°C. Significant changes in material properties took place. AC increased the density and reduced MOEdyn, EMC and swelling strain. FA increased the density and the swelling coefficient and reduced EMC and swelling strain. HT reduced the EMC, while MMF modification increased it.
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Articles in the same Issue
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Articles in the same Issue
- MWL fraction with a high concentration of lignin-carbohydrate linkages: Isolation and 2D NMR spectroscopic analysis
- Papermaking properties of the ECF-bleached kraft pulps from first-thinning Scots pine (Pinus sylvestris L.)
- Syntheses and properties of liquefied products of ozone treated wood/epoxy resins having high wood contents
- Quality control of thermally modified timber: Interrelationship between heat treatment intensities and CIE L*a*b* color data on homogenized wood samples
- Violet light causes photodegradation of wood beyond the zone affected by ultraviolet radiation
- Dynamic mechanical analysis of dry wood: Linear viscoelastic response region and effects of minor moisture changes
- Material properties and their interrelation in chemically modified clear wood of Scots pine
- Effect of treatments with 1,3-dimethylol-4,5-dihydroxy-ethyleneurea (DMDHEU) on the tensile properties of wood
- Penetration of amino-silicone micro- and macro-emulsions into Scots pine sapwood and the effect on water-related properties
- Search for a relationship between stress wave velocity and internal stresses in eucalypts and radiata pine
- Kiln-drying lumber quality of hybrid poplar clones
- Heat and mass transfer in wood composite panels during hot pressing: Part 3. Predicted variations and interactions of the pressing variables
- Heat and mass transfer in wood composite panels during hot pressing: Part 4. Experimental investigation and model validation
- Dielectric relaxation of water adsorbed on wood and charcoal
- Properties of piezoelectric voltage considering the microscopic structure of wood cell walls
- Adjusting for fibre length-biased sampling probability using increment cores from standing trees
- External and internal fungal flora of pine sapwood (Pinus sylvestris L.) specimens in above-ground field tests at six different sites in south-west Germany
- Award Presentation on the occasion of the European Workshop on Lignocellulosics and Pulp (EWLP 2006) in Vienna
- Phenolic compounds in silver birch (Betula pendula Roth) wood
