Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
권호 표지

Chemical and Morphological Change and Discoloration of Cedar Wood Stored Indoor

실내 보관 삼나무 목재의 재색 및 화학적·현미경적 변화 특성

  • 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)
  • 이광호 (전남대학교 농업생명과학대학 임산공학과) ;
  • 차미영 (전남대학교 농업생명과학대학 임산공학과) ;
  • 정우양 (전남대학교 농업생명과학대학 임산공학과) ;
  • 배현종 (전남대학교 농업생명과학대학 임산공학과) ;
  • 김윤수 (전남대학교 농업생명과학대학 임산공학과)
  • Received : 2009.03.05
  • Accepted : 2009.10.01
  • Published : 2009.11.25
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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.

실내에서 일어나는 목재의 표면 열화특성을 재색, 화학적 및 해부학적 변화 차원에서 분석하였다. 실험대상으로는 실내에서 장기간 보관중인 삼나무 목제품을 사용하였다. 실내 보존 초기에는 황색도와 적색도가 급격히 변하였고 5년 사이에 백색도의 감소가 두드러졌다. 화학성분의 분석결과 셀룰로오스, 헤미셀룰로오스, 리그닌 성분 모두 감소하였으나 리그닌의 감소가 더 컸다. 현미경 관찰 결과 5년이 경과한 목제품에서는 목재표면에서 2~3개 층에서 리그닌이 분해되어 중간층이 분리되었다. 실내 환경조건에서 발생되는 표면 열화 특성은 야외에서 발생되는 표면열화 특성과 매우 유사하였으나 그 정도는 미약하였다.

Keywords

Acknowledgement

Supported by : 교육과학기술부

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