Brischke C.,Leibniz University of Hanover |
Welzbacher C.R.,Heinz Piest Institute of Craftsmen Technique HPI |
Gellerich A.,University of Gottingen |
Bollmus S.,University of Gottingen |
And 6 more authors.
European Journal of Wood and Wood Products | Year: 2014
In Europe, the durability of wood against wood-destroying basidiomycetes is tested according to CEN/TS 15083-1 (Durability of wood and wood-based products - determination of the natural durability of solid wood against wood-destroying fungi, test methods - part 1: basidiomycetes, 2005). Existing experience with this standard is quite heterogeneous wherefore six research institutions teamed up and established a new round-robin trial. Fagus sylvatica, Quercus robur, Robinia pseudoacacia as well as sap- and heartwood of Pinus sylvestris, were tested against Coniophora puteana and Trametes versicolor without any pre-treatment, with pre-leaching (EN 84) and with 6 months natural weathering of the specimens. Durability classification revealed differences between test laboratories and depended on pre-treatment and respective statistical measures applied. © 2013 Springer-Verlag Berlin Heidelberg.
Frenzel R.,Leibniz Institute of Polymer Research |
Swaboda C.,Institute fur Holztechnologie Dresden Gemeinnutzige GmbH IHD |
Petzold G.,Leibniz Institute of Polymer Research |
Emmler R.,Institute fur Holztechnologie Dresden Gemeinnutzige GmbH IHD |
Simon F.,Leibniz Institute of Polymer Research
Progress in Organic Coatings | Year: 2011
National and European legal rules and regulations require the replacement of solvent paints by water-born paints. Water on wood surfaces leads to significant problems because water can penetrate the pore system of wood and causes a swelling of the wood. The aim of our work was the reduction of water uptake of wood by polyelectrolytes with the surface polarity and wetting behavior of the wood surfaces should not be significantly changed. Cellulose materials, such as wood show in presence of moderately acidic, neutral or basic aqueous solutions a negative net surface charge. Therefore, for surface modifications of wood samples different commercially available cationic polyelectrolytes were used. In particular, weak polyelectrolytes were likely to reduce the water uptake of wood. They also slightly decrease the surface polarity of wood surfaces, which was advantageous for the rapid wetting of wood. Moreover, the reactive functional groups of the weak polyelectrolytes were used for subsequent cross-linking reactions to form irreversibly anchored polyelectrolyte networks on the wood surfaces. © 2010 Elsevier B.V. All rights reserved.