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Thermal degradation of wood during photodegradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
30778 44502 2011 4 PDF Available
Title
Thermal degradation of wood during photodegradation
Abstract

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 1746 cm−1 increased and the peak of the aromatic skeletal vibration arising from lignin (1510 cm−1) decreased together with the guaiacyl vibrations at 1275 cm−1. There was absorption decrease at 1174 cm−1 because of the ether band splitting. Under the covered surface only the ether band at 1174 cm−1 decreased and one carbonyl band increased with a maximum at 1715 cm−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.

► Wood samples were irradiated by three types of light source. ► Thermal degradation caused by light irradiation was investigated. ► Colour change and IR spectra were evaluated. ► Colour change was much greater in humid condition than in dry condition.

Keywords
Wood; Thermal degradation; Photodegradation; Colour change; Infrared spectroscopy
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Thermal degradation of wood during photodegradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 105, Issue 1, 5 October 2011, Pages 90–93
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us