Abstract
The study investigated and compared the behaviour of four wood species, originating from Europe and China, in terms of temperature-induced artificial ageing. It was conducted at 100 °C for a total period of 288 h. Ageing effects were evaluated by colour measurements in the CIE Lab system and by FTIR analysis. Colour changes were then related to chemical changes in the wood. The investigated wood species were European ash (Fraxinus excelsior), European walnut (Juglans regia), Chinese ash (Fraxinus mandshurica) and Chinese walnut (Juglans mandshurica). Colour changes were maximum for European ash and minimum for Chinese ash, while European walnut and Chinese walnut evolved quite similarly. Main chemical changes due to temperature ageing were reduction of hydroxyl groups, increase of the unconjugated carbonyl groups and an apparent slight increase of lignin, more evident for European ash and delayed for European walnut. Formation of aromatic carbonyl conjugated groups as quinoid structures as a result of oxidative reactions was revealed especially for European ash. The different behaviour of the studied wood species may be explained by their different chemical composition, especially hemicelluloses, lignin and extractives content.
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Acknowledgments
We hereby acknowledge the structural founds project PRO-DD (POS-CCE, O.2.2.1., ID 123, SMIS 2637, Ctr. No 11/2009) for providing the infrastructure used in this work. This research is part of a 3-year Ph.D. project sustained by Transilvania University of Brasov, Romanian Ministry of Education and Research, the Government of Republic of China and the Embassy of China in Bucharest. We are also grateful to our sponsors providing the wood material for experiments: JF Furnir (European Species) and Beijing Forestry University (Chinese species).
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Liu, X.Y., Timar, M.C., Varodi, A.M. et al. An investigation of accelerated temperature-induced ageing of four wood species: colour and FTIR. Wood Sci Technol 51, 357–378 (2017). https://doi.org/10.1007/s00226-016-0867-4
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DOI: https://doi.org/10.1007/s00226-016-0867-4