부산대학교 도서관

The influence of extractives in the photodegradation of wood has not been fully clarified. The aim of this study was to understand the role of extractives during wood photodegradation process. FTIR and X-ray photoelectron spectroscopy (XPS) were used to analyze the variations in chemical characteristics on the wood surfaces of non-extracted and extracted Cryptomeria japonica heartwood after lightfastness test. FTIR analysis showed that lignin on the extracted wood surface degraded significantly after lightfastness test. Consequently, the contents of carbonyl and water-soluble derivatives from lignin increased markedly. However, degradation of lignin occurred to a lesser extend on the non-extracted heartwood surface. Results from XPS survey analyses revealed that non-extracted heartwood exhibited a higher O/C ratio than the extracted one. Furthermore, results from the detail analysis of C(subscript 1s) indicated that carbonyl and carboxylic derivatives increased on both specimens after lightfastness test. On extracted specimen the derivatives were mainly derived from lignin, whereas extractives were the major component for the generation of derivatives on non-extracted specimen surface. In conclusion, extractives played an essential role in retarding the photodegradation of wood and the rate of wood degradation was decreased by the presence of extractives.