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Title: Sol-gel modification of wood substrates to retard weathering

Author: Tshabalala, Mandla A; Williams, Sam;

Date: 2008

Source: PRA’s 6th International Woodcoatings Congress : "preserve, protect, prolong", Amsterdam, The Netherlands, 14-15 October 2008, conference papers. Hampton : PRA Coatings Technology Centre, 2008: 14 p.: ISBN: 9780955131752: 0955131758.

Publication Series: Miscellaneous Publication

Description: Wood specimens were treated with sol-gel systems based on metalorganic precursors of silicon (Si), iron (Fe), zirconium (Zr), and titanium (Ti). The effect of these sol-gel systems on weathering properties of wood was investigated. These sol-gel systems were found to have a positive effect on surface color stability and water vapor resistance of the specimens. Under accelerated weathering conditions, the sol-gel systems retarded the degradation of the wood fiber. Scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA), after accelerated weathering in a Weather-Ometer™, showed a marked difference between the treated specimens and the controls in the pattern and localization of degradation. Although the controls showed severe micro-fracturing of the cell walls, the treated specimens showed no such micro-fracturing. On the contrary, the sol-gel-treated specimens showed micro-checks that were predominantly confined to weak areas of the cell wall, such as fusiform rays and the tracheid interfaces.

Keywords: Wood surfaces, wood deterioration, coatings, deterioration, thin films, moisture, water repellents, wood moisture, surface chemistry, weathering, titanium, color-fading, ultraviolet radiation, zirconium, stabilizing agents, plant cell walls, iron, silicon, accelerated life testing, scanning electron microscopy, sol-gel deposition, moisture content, durability, exposure tests, discoloration, titanium compounds, photodegradation, photostabilization, surface properties, accelerated testing, Energy dispersive x-ray analysis

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Tshabalala, Mandla A; Williams, R. Sam; 2008. Sol-gel modification of wood substrates to retard weathering. In: PRA’s 6th International Woodcoatings Congress : "preserve, protect, prolong", Amsterdam, The Netherlands, 14-15 October 2008, conference papers. Hampton : PRA Coatings Technology Centre, 2008: 14 p.: ISBN: 9780955131752: 0955131758.

 


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