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A spectrocolorimetric and chemical study on color modification of heat-treated wood during artificial weathering

Huang Xianai, Kocaefe Duygu, Kocaefe Yasar S., Boluk Yaman et Pichette André. (2012). A spectrocolorimetric and chemical study on color modification of heat-treated wood during artificial weathering. Applied Surface Science, 258, (14), p. 5360-5369.

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URL officielle: https://doi.org/10.1016/j.apsusc.2012.02.005

Résumé

Effect of artificial weathering on the wood surface color modifications of three North American species (jack pine, aspen, and birch) heat-treated under different temperatures was studied by spectrocolorimetric colormeter (datacolor, CHECK TM). Data was analyzed using the reflectance spectra (400–700 nm) as well as the CIE-L*a*b* system and _E. Kubelka–Munk (K–M) spectra of samples were recorded as a function of artificial weathering time to obtain the absorption maxima of the chromophore woods formed during artificial weathering. The results were compared with those of the respective untreated (Kiln-dried) species. Analysis of chemical components shows that the lignin percent of jack pine, aspen, and birch increased after heat treatment (28.66–35.9%, 20.27–26.41%, and 19.04–22.71% respectively) which might be due to smaller influence of heat treatment on lignin content than hemicelluloses. This improves the resistance of heat-treated wood to photo-degradation. This is also supported by the smaller change observed in K–M spectra and total color parameters in CIE-L*a*b* system of heat-treated wood samples compared to those of untreated wood when weathered for72 h. However, the lignin percent of heat-treated woods reduce to maximum 2.5% after artificial weathering of 1512 h. This suggests that the weathering degrades most lignin matrix; consequently, both the colors of heat-treated woods and untreated woods are lighter and very similar after a long period of artificial weathering.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:258
Numéro:14
Pages:p. 5360-5369
Version évaluée par les pairs:Oui
Date:2012
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:Heat-treated wood, color modifications, artificial weathering, chemical component degradation, reflectance spectra, Kubelka-Munk, CIE-L*a*b* parameters
Déposé le:21 févr. 2019 22:40
Dernière modification:27 févr. 2019 00:41
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