The Effects of Heat Treatment on the Chemical Alterations of Oak Wood

Abstract:

Samples prepared from oak (Quercus robur L.) wood were exposed to heat treatment at temperatures of 160, 180, 200 and 220 oC for 3, 6, 9 and 12 hours. In both untreated and thermally treated wood there were determined extractives and lignin by National Renewable Energy Laboratory (NREL) procedures, cellulose by Seifert's method, holocellulose according to Wise, hemicelluloses as difference between holocellulose and cellulose. Monosaccharides were determined by high performance liquid chromatography (NREL).The results show that hemicelluloses are less stable at thermal treatment than cellulose. The amounts of lignin and extractives rose by increasing both temperature and time of the treatment while the amounts of hemicelluloses decreased. Thermal treatment also resulted in significant decreases of the yields of non-glucosic saccharides. Degradation of carbohydrates can cause the deterioration of mechanical properties of wood.

• Periodical: Key Engineering Materials (Volume 688)
• Pages: 44-49
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.688.44
• Online since: April 2016
• Authors: Iveta Čabalová*, František Kačík, Tereza Tribulová
• Keywords: Carbohydrates, Cellulose, Extractives, Hemicelluloses, Lignin, Oak, Thermal Treatment

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