Diffuse Reflectance Infrared Fourier Transform Spectroscopy (Drift) and Color Changes of Artificial Weathered Wood
Keywords:DRIFT, wood weathering rate, color change, lightness modification, semi-quantification
AbstractShort-term (22.7 h) accelerated weathering was performed on black cherry (Prunus serotina), soft maple (Acer saccharinum), and red oak (Quercus rubra) using a 2-h ultraviolet (UV) light irradiation and 0.3-h water spray regime. Contributions to the wood surface color change from changes in lightness, chroma, and hue were observed, and variations existed among wood species. Chemical modifications on wood surfaces were monitored semi-quantitatively by using Diffuse Reflectance Infrared Fourier Transform spectroscopy (DRIFT). Band intensities at 1170 cm-1, 1510 cm-1, and 1740 cm-1 were used to follow the photodegradation on the wood surface during the 22.7-h accelerated weathering. Linear correlation was observed between the ratio of band intensity at 1740 cm-1 relative to the band intensity at 1170 cm-1, and the color change or the lightness modification. Results from this study clearly indicated that the rates of weathering/photodegradation of wood are influenced by wood species. Soft maple and red oak exhibit similar weathering rate (0.048) and higher than that of black cherry (0.031).
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