Effects of UV light irradiation on colour stability of thermally modified, copper ethanolamine treated and non-modified wood : EPR and DRIFT spectroscopic studies
Deka, Manabendra (Author), Humar, Miha (Author), Rep, Gregor (Author), Kričej, Borut (Author), Šentjurc, Marjeta (Author), Petrič, Marko (Author)

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A series of experiments were carried out to investigate the colour stability of chemically treated and thermally modified wood compared to non-modified wood during long term artificial UV light irradiation. One set of wood samples was vacuum-pressure impregnated with alkaline (pH 9.8) copper (II) ethanolamine aqueous solution, while another set of samples from the same woodblock was thermally modified at 210C and -0.90 bar for 2 h. The treated and modified wood samples along with the non-modified ones were exposed to artificial UV light with the wave length in the region of UVA (315-400 nm) and UVB (280-315 nm) intermittently for 500 h. Colour measurements were carriedout throughout the irradiation period at an interval of 100 h accordingto CIEL*a*b* system, where the results are presented in terms of ?E, ?L*, ?a* and ?b* values. Better photo-stability in terms of colour changes was recorded for both treated and modified woods compared to the non-modified one. By means of EPR and DRIFT spectroscopic study it was shown that some degree of colour stability of treated and modified woods, achieved during artificial UV light irradiation, resulted from lignin modifications and monomers of phenolic compounds.

Keywords:wood, thermal modification, colour, EPR spectroscopy
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Number of pages:Str. 5-20
Numbering:Vol. 42, no. 1
ISSN on article:0043-7719
COBISS.SI-ID:1513353 This link opens in a new window
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Record is a part of a journal

Title:Wood Science and Technology
Shortened title:Wood Sci. Technol.
COBISS.SI-ID:9151749 This link opens in a new window

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