title: Acetylation of wood causes photobleaching.
abstract: This paper deals with the photobleaching of acetylated wood. The acetylated spruce wood was irradiated by artificial sunlight emitted from xenon lamp with covering several kinds of band-pass filter. The lightness (L(*)) of acetylated wood increased with integral irradiance. The chroma (ΔC(*)) decreased by light-irradiation with wavelength from 430nm to 500nm. However, the light-irradiation including ultraviolet ray region made it decrease after increase with integral irradiance. The visible light made hue angle (h°) increase, however, the ultraviolet ray made it decrease. The lignin degradation and the production of carbonyl groups were observed by light-irradiation including ultraviolet ray. However, no remarkable changes in IR spectra were observed by visible light-irradiation. Photobleaching of acetylated wood was caused by mainly visible light without modifying the IR spectra of lignin.
authors.affiliation: Gifu Prefectural Human Life Technology Research Institute, Takayama 506-0058, Japan. mitsui@wood.rd.pref.gifu.jp
authors.forename: Katsuya
authors.initials: K
authors.lastname: Mitsui
mesh_terms: D000107:Acetylation; D003116:Color; D008027:Light; D038761:Photobleaching; D013055:Spectrophotometry, Infrared; D014934:Wood / Q000737:chemistry*