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Abstract
FT-IR microscopy was used to depth profile the photodegradation of Japanese cedar earlywood exposed to monochromatic light in the UV and visible ranges (band pass: 20nm). Parallel experiments assessed the transmission of the light through thin sections of Japanese cedar. The depth of photodegradation increased with wavelength up to and including the violet region of the visible spectrum, but decreased in the blue region. In contrast, penetration of light into Japanese cedar was positively correlated with wavelength. We concluded that violet light has sufficient energy to degrade wood and extends photodegradation into wood beyond the zone affected by UV radiation. Accordingly, surface treatment designed to protect wood used outdoors should protect wood from the effects of violet light.
Keywords
Fourier transform infrared microscopy,
infrared microscopy,
ultraviolet radiation,
Cryptomeria japonica,
weathering,
deterioration,
Sugi,
visible light,
photodegradation,
degradation,
earlywood,
penetration,
violet light
Citation
Kataoka, Yutaka; Kiguchi, Makoto; Williams, R. Sam; Evans, Philip D. 2006. The effects of wavelength on photodegradation depth profiles in Japanese cedar (Cryptomeria japonica D. Don) earlywood. Proceedings of the Fifth International Woodcoatings Congress : Enhancing Service Life, 2006 October 17-18, Prague, Czech Republic. Middlesex, UK : PRA Coatings Technology Centre, c2006: 11 p.: ISBN: 9780955131745: 095513174X
