UV-laser irradiated wood: Some aspects on micromorphology, wettability, surface composition and liquid permeability
2008 (English)In: Proceedings of the 4th meeting of the Nordic-Baltic network in wood material science and engineering (WSE), 2008, 75-82 p.Conference paper (Refereed)
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.
Place, publisher, year, edition, pages
2008. 75-82 p.
Composite Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-81291OAI: oai:DiVA.org:kth-81291DiVA: diva2:497283
4th meeting of the Nordic-Baltic network in wood material science and engineering (WSE). Riga, Latvia. 13-14 Nov 2008
QC 201205072012-02-102012-02-102012-05-07Bibliographically approved