UV-laser irradiated wood - some aspects on micromorphology, wettability, surface composition and liquid permeability
2008
Bryne, L.E., KTH Royal Inst. of Technology, Stockholm (Sweden). Building Materials | Lausmaa, J., SP Technical Research Inst. of Sweden, Boraas (Sweden). Chemistry and Materials Technology | Ernstsson, M., Institute for Surface Chemistry, Stockholm (Sweden) | Englund, F., SP Traetek, Technical Research Inst. of Sweden, Stockholm (Sweden). Wood Technology | Waalinder, M.E.P., SP Traetek, Technical Research Inst. of Sweden, Stockholm (Sweden). Wood Technology;KTH Royal Inst. of Technology, Stockholm (Sweden). Building Materials | Soederstroem, O., KTH Royal Inst. of Technology, Stockholm (Sweden). Building Materials
Many wood products used as building or construction materials involve a combination of the wood material with polymers, such as adhesives, coatings, preservatives and binders in composites. Combinations of wood and polymers in outdoor exposure, however, in general have poor long-term durability. A major cause of the unsatisfactory durability can be related to the high hygroscopicity of wood and the great difference in hygro-thermal properties between the components, resulting in wood-polymer de-bonding. In addition, mechanical processing (e.g. sawing, sanding and planning) of wood in general forms a weak boundary layer of loose and crushed wood cells in the surface which also may interfere with the wood-polymer bonding. The main objective of this work was to study ultra violet (EV), or excimer, laser irradiation on wood as a means to remove, by ablation, the outer deformed layer from a wood substrate. Effects of the UV-laser treatment on wetting and liquid permeability characteristics were studied by Wilhelmy plate experiments, and effects on the wood surface chemistry were studied by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The micromorphology of wood was studied by low vacuum-scanning electron microscopy (LV-SEM). The pre-treatment of wood substrates by UV-laser ablation resulted in a notable changes in surface micromorphology, liquid permeability, wettability and surface chemistry characteristics.
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