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Changes in the properties of light-irradiated wood with heat treatment: Part 3. Monitoring by DRIFT spectroscopy

Veränderung der Eigenschaften von lichtbestrahltem Holz durch Hitzebehandlung: Teil 3. Beobachtung mittels DRIFT-Spektroskopie

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Abstract

This study investigated the effect of heat treatment on the color and DRIFT spectra of light-irradiated heartwood of Japanese cedar. The heat number of carbonyl groups caused by light-irradiation decreased with increasing relative humidity during treatment. Although two sub-bands of carbonyl groups changed with exposure to light, with heat treatment after light-irradiation the carbonyl band at 1,756 cm−1 decreased more than that at 1,716 cm−1. The change in the color of wood with light-irradiation is related to the degradation of lignin. However, it is assumed that the changes caused by heat treatment in unirradiated and irradiated wood are related not to lignin degradation but to low molecular compounds that are produced from lignin by light-irradiation and hemicellulose.

Zusammenfassung

Diese Studie untersuchte den Einfluss einer Hitzebehandlung auf die Farb- und DRIFT-Spektren von lichtbestrahltem japanischen Zedern-Kernholz. Die durch Lichtbestrahlung entstandene Anzahl von Carbonyl-Gruppen nahm ab durch die anwachsende relative Feuchte während der Behandlung. Obwohl sich zwei Nebenbanden der Carbonyl-Gruppen veränderten, nachdem sie dem Licht ausgesetzt wurden, nahm die Carbonyl-Gruppe bei 1.756 cm−1 durch Hitzebehandlung mehr ab als die bei 1.716 cm−1. Die Farbänderung im Holz hängt mit dem Abbau von Lignin zusammen. Jedoch wird angenommen, dass die durch die Hitzebehandlung verursachten Veränderungen bei unbestrahltem und bestrahltem Holz nicht auf den Ligninabbau zurückgeführt werden können, sondern auf die niedrig-molekularen Komponenten, die durch Lichtbestrahlung aus Lignin und Hemicellulose entstehen.

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Acknowledgment

This research was supported by the Industrial Technology Research Grant Program in 2002, of the New Energy and Industrial Technology Development Organization, Japan.

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Authors and Affiliations

  1. Gifu Prefectural Human Life Technology Research Institute, 1554 Yamada, Takayama 506-0058, Japan

    K. Mitsui & A. Murata

  2. Institute of Physics, University of West Hungary, Ady Endre u. 5., 9400, Sopron, Hungary

    L. Tolvaj

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  1. K. Mitsui
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  2. A. Murata
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  3. L. Tolvaj
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Correspondence to K. Mitsui.

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Mitsui, K., Murata, A. & Tolvaj, L. Changes in the properties of light-irradiated wood with heat treatment: Part 3. Monitoring by DRIFT spectroscopy. Holz Roh Werkst 62, 164–168 (2004). https://doi.org/10.1007/s00107-004-0476-z

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