Reasons for colour changes during thermal and hydrothermal treatment of wood | Vzroki barvnih sprememb med termicno in hidrotermicno obdelavo lesa
2008
Kutnar, A., Ljubljana Univ. (Slovenia). Biotechnical Fac., Wood Science and Technology Dept. | Sernek, M.
The chemical composition of wood in relation to its thermal and hydrothermal treatment is discussed. The degradation and modification processes, which take place during hydrothermal treatment, are presented. The chemical reasons for the increased dimensional stability, reduced moisture content and improved biological durability of hydrothermally treated wood are given. Particular attention is given to the chemical reactions that can cause the darker tonality of hydrothermally treated wood. The literature review of chemical explanations for wood colour changes ranges from the degradation of hemicelluloses through oxidation reactions to lignin polymerization reactions. Intermediate lignin degradation products are considered to be the main source of colour changes in hydrothermally treated wood.
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