EPR and DRIFT spectroscopic studies
Manabendra Deka (Author), Miha Humar (Author), Gregor Rep (Author), Borut Kričej (Author), Marjeta Šentjurc (Author), Marko Petrič (Author)

Abstract

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;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 674.04
COBISS: 1513353 Link will open in a new window
ISSN: 0043-7719
Views: 1031
Downloads: 234
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Other data

Secondary language: English
Type (COBISS): Not categorized
Pages: str. 5-20
Volume: ǂVol. ǂ42
Issue: ǂno. ǂ1
Chronology: 2008
ID: 1033419