Abstract Nanoparticles of some of the metal oxides are known to have high UV protective efficiency. The UV filtering efficiency of nanoparticles invariably depends on their size and stability in the dispersion. In the present work, a stable dispersion of nanoparticles of three metal oxides, zinc oxide (ZnO), cerium oxide (CeO2) and titanium dioxide (TiO2), was prepared in propylene glycol (PG) using ultrasonication. The method … Continue reading UV stabilization of wood by nano metal oxides dispersed in propylene glycol

Abstract In this study, influence of tannin containing coating combined with zinc and cerium oxide nanoparticles on color, gloss, surface roughness and macroscopic changes of Scots pine wood after artificial weathering was studied. For this purpose, 3 different tannin types, valex, mimosa and pine with various concentrations, 2 metal oxides, nano zinc and cerium oxide, and a water based transparent coating were used. Commercially available nano wood coating was used as a … Continue reading Influence of tannin containing coatings on weathering resistance of wood: Combination with zinc and cerium oxide nanoparticles

Abstract Thermal modification processes significant affect the chemical configuration of the wood matrix improving moisture-related properties and material durability. In addition, the distinctive dark tones of heat-treated timber increase the economic value of several light-colored species. However, these treatments alter the substrates and it could influence the performance of coating products, necessary to maintain the surface features in certain end-use sectors. Ash wood (Fraxinus excelsior L.) samples industrially … Continue reading Weathering resistance of thermally modified wood finished with coatings of diverse formulations

Abstract The aim of this study was to improve weathering resistance of Scots pine wood by treating the surfaces with water based transparent and opaque wood coatings containing valex, mimosa and pine tannins. Samples coated with tannin containing coatings with various concentrations were exposed to artificial weathering for 1512 h. Color, gloss, surface roughness and macroscopic changes were evaluated periodically during the test, and the results … Continue reading Influence of tannin containing coatings on weathering resistance of wood: Water based transparent and opaque coatings

Abstract The paper describes new epoxy derivatives and their influences on wood thermal and fungi stability. Epoxy derivatives were thermally and photochemically cross-linked. The softwood samples, modified with succinic anhydride, were impregnated individually or in the mixture with glycidyl methacrylate, diglycidyl ether of bisphenol A, and epoxidized grapeseed oil and cross-linked afterward. The samples impregnated with glycidyl methacrylate were first exposed to UV at 254 … Continue reading Enhancing the Thermal and Fungal Resistance of Wood Treated with Natural and Synthetic Derived Epoxy Resins

Abstract In order to clarify the relationship between photodegradation and biological degradation, wood specimens finished with a semi-clear coating were degraded under a xenon lamp for different periods of time. The specimens were then inoculated one of two black stain fungi (Aureobasidium pullulans and Epicoccum nigrum). Colonization was monitored visually and by colorimetric analyses. The extent and the nature of the degradation were evaluated using different techniques. The chemical … Continue reading Weathering of wood coated with semi-clear coating: Study of interactions between photo and biodegradation