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Wood Science and Technology

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01.01.2008 | Original

Effects of UV light irradiation on colour stability of thermally modified, copper ethanolamine treated and non-modified wood: EPR and DRIFT spectroscopic studies

verfasst von: Manabendra Deka, Miha Humar, Gregor Rep, Borut Kričej, Marjeta Šentjurc, Marko Petrič

Erschienen in: Wood Science and Technology | Ausgabe 1/2008

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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 wood block was thermally modified at 210°C 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 carried out throughout the irradiation period at an interval of 100 h according to CIEL*a*b* system, where the results are presented in terms of ΔE, ΔL*, Δa* and Δb* 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.

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Nächster Artikel Numerical modelling of moisture movement and related stress field in lime wood subjected to changing climate conditions

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Titel: Effects of UV light irradiation on colour stability of thermally modified, copper ethanolamine treated and non-modified wood: EPR and DRIFT spectroscopic studies
verfasst von: Manabendra Deka
Miha Humar
Gregor Rep
Borut Kričej
Marjeta Šentjurc
Marko Petrič
Publikationsdatum: 01.01.2008
Verlag: Springer-Verlag
Erschienen in: Wood Science and Technology / Ausgabe 1/2008
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI: https://doi.org/10.1007/s00226-007-0147-4

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