Chemical characteristics of surfaces of hardwood and softwood deteriorated by weathering |
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Authors: | Yanni Sudiyani Sho-ichi Tsujiyama Yuji Imamura Munezoh Takahashi Kazuya Minato Hiromu Kajita |
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Institution: | (1) Research and Development Center for Applied Physics, LIPI, 13510 Serpong, Tangerang, Indonesia;(2) Faculty of Agriculture, Kyoto Prefectural University, 606-8522 Kyoto, Japan;(3) Wood Research Institute, Kyoto University, Uji, 611-0011 Kyoto, Japan;(4) Graduate School of Agriculture, Kyoto University, 606-8502 Kyoto, Japan |
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Abstract: | The factors that cause weather-induced deterioration of wood surfaces were determined by chemical and spectroscopic analyses. Albizzia (Paraserianthes falcata Becker.) and sugi (Cryptomeria japonica D. Don) were exposed to two temperate conditions of natural weathering with and without rainfall and to accelerated conditions of artificial weathering coupled with ultraviolet (UV) light irradiation and water flashing. Infrared spectroscopic analysis showed that the oxidative reaction of lignin was observed under all conditions of weathering for both wood species. However, a marked decrease in lignin and hemicellulose content were recognized when albizzia woods were exposed to weathering with water. Lignin content in the softwood sugi did not decrease as much as in albizzia even in the presence of water, but the modification of lignin macromolecules was assumed to be accelerated by water, as seen by electron spin resonance spectroscopy. These results showed that the presence of water promotes the weathering deterioration of wood under UV irradiation. |
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Keywords: | Chemical analysis Cryptomeria japonica ESR analysis IR spectroscopy Paraserianthes falcata Weathering |
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