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Hannah Epmeier, Marie Johansson, Robert Kliger, Mats Westin

Material properties and their interrelation in chemically modified clear wood of Scots pine

Keywords: acetylation (AC), correlation, Density, equilibrium moisture content (EMC), furfurylation (FA), heat treatment in vegetable oil (HT), methylated melamine formaldehyde resin (MMF), MOE, modification, shrinkage/swelling

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 (MOE_dyn) 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 MOE_dyn, 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.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 61, 01/2007
Pages: 34 - 42

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