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A platform for research: civil engineering, architecture and urbanism
Changes in mechanical properties of furfurylated wood
The search for enhanced wood products and the ability to use wood in new applications are driving forces for research in modification of wood. Mechanical and physical properties and resistance to fungal decay are often improved, but impact bending is normally reduced by chemical modification. A promising method of wood modification is the furfurylation process (reaction with furfuryl alcohol under weak acidic conditions at elevated temperatures). Major improvements are decay resistance, dimensional stability and to some extent: stiffness, hardness and modulus of rupture but impact bending strength has been found to decrease. The change in impact strength properties could originate from both cross-linking and hydrolysis of cell wall constituents. Furfurylated softwood products are on the market for about 2 years from a commercial production plant. The demand for such wood for cladding, decking and roofing (where impact strength is of minor importance) is constantly increasing. In addition, a study where furfurylated wood was subjected to accelerated climatic ageing by exposing the wood samples to 80 deg C and 100 % relative humidity for 10, 28 and 38 days is presented. There was a significant reduction of impact bending due to treatment, and a trend towards a minor reduction due to the exposure, which however was not statistically significant. Furfurylated sapwood of Scots pine [Pinus sylvestris) had a reduction of impact bending strength from 19-37% with an average of 24%.
Changes in mechanical properties of furfurylated wood
The search for enhanced wood products and the ability to use wood in new applications are driving forces for research in modification of wood. Mechanical and physical properties and resistance to fungal decay are often improved, but impact bending is normally reduced by chemical modification. A promising method of wood modification is the furfurylation process (reaction with furfuryl alcohol under weak acidic conditions at elevated temperatures). Major improvements are decay resistance, dimensional stability and to some extent: stiffness, hardness and modulus of rupture but impact bending strength has been found to decrease. The change in impact strength properties could originate from both cross-linking and hydrolysis of cell wall constituents. Furfurylated softwood products are on the market for about 2 years from a commercial production plant. The demand for such wood for cladding, decking and roofing (where impact strength is of minor importance) is constantly increasing. In addition, a study where furfurylated wood was subjected to accelerated climatic ageing by exposing the wood samples to 80 deg C and 100 % relative humidity for 10, 28 and 38 days is presented. There was a significant reduction of impact bending due to treatment, and a trend towards a minor reduction due to the exposure, which however was not statistically significant. Furfurylated sapwood of Scots pine [Pinus sylvestris) had a reduction of impact bending strength from 19-37% with an average of 24%.
Changes in mechanical properties of furfurylated wood
Lande, Stig (author) / Eikenes, Morten (author) / Westin, Mats (author) / Schneider, Marc (author)
2005
6 Seiten, 1 Bild, 2 Tabellen, 17 Quellen
Conference paper
English
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