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Chemical and Morphological Change and Discoloration of Cedar Wood Stored Indoor  

Lee, Kwang Ho (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Cha, Mi Young (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Chung, Woo Yang (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Bae, Hyeun-Jong (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Kim, Yoon Soo (Department of Forest Products and Technology, College of Agriculture, Chonnam National University)
Publication Information
Journal of the Korean Wood Science and Technology / v.37, no.6, 2009 , pp. 566-577 More about this Journal
Abstract
The modification of wood color occurs rapidly during the service period at indoor. It is crucial to investigate the characteristics of color change, chemical and microscopical modification of wood at indoor. Wood products made of Japanese cedar at different years were used for this work. The tests were performed in order to evaluate the degree of color change of wood surface, breakpoint of brightness from surface to inside of wood, chemical analysis with FT-IR, and microscopical characteristics using the LM and TEM. Surface color of cedar wood stored indoor were rapidly changed at early stage, particularly ${\Delta}a$ (yellow), and ${\Delta}b$ (red) values were steeply decreased for one year old indoor wood, ${\Delta}L$ (white) value was dropped until 5 years old indoor wood compared with control sample. Decrease of peaks related to polysaccharide and lignin was noticed, especially, lignin was severely degraded. Although degradation of cell wall limited only to surface layers of indoor wood, degradation pattern of indoor wood showed similar degradation pattern to natural weathering of wood during outdoor weathering or wood behavior under artificial UV irradiation.
Keywords
discoloration; indoor wood; Cryptomeria japonica; chemical and morphological change;
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