| Thermal degradation of wood during photodegradation. | |
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MedLine Citation:
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PMID: 21820317 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In this study, wood samples were exposed to light irradiations (direct sunlight, xenon lamp, mercury vapour lamp) and thermal treatments were carried out in dry- and in humid conditions at 90°C. One part of the samples was covered by an aluminium plate during light irradiation. The samples under the aluminium plate also suffered considerable chemical changes, monitored by infrared technique and colour measurement. The sunlight produced greater colour change under the aluminium plate than the artificial light sources. During light irradiation, the carbonyl band having two maximum at 1700 and 1746cm(-1) increased and the peak of the aromatic skeletal vibration arising from lignin (1510cm(-1)) decreased together with the guaiacyl vibrations at 1275cm(-1). There was absorption decrease at 1174cm(-1) because of the ether band splitting. Under the covered surface only the ether band at 1174cm(-1) decreased and one carbonyl band increased with a maximum at 1715cm(-1). Degradation of lignin was negligible for the covered surface. Colour change generated by thermal degradation was much greater in humid condition than in dry condition. |
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Authors:
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Laszlo Tolvaj; Laszlo Persze; Levente Albert |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-22 |
Journal Detail:
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Title: Journal of photochemistry and photobiology. B, Biology Volume: - ISSN: 1873-2682 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-8-8 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8804966 Medline TA: J Photochem Photobiol B Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2011 Elsevier B.V. All rights reserved. |
Affiliation:
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University of West Hungary, Bajcsy Zs. u. 4., Sopron, Hungary. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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