Changes in the microstructure of birch wood after hydrothermal treatment |
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| Authors: | Vladimirs Biziks Bruno Andersons ?ubova Be?kova Elīna Kapa?a Holger Militz |
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| Institution: | 1. Latvian State Institute of Wood Chemistry, 27 Dzerbenes str., Riga, 1006, Latvia
2. Wood Biology and Wood Products, Burckhardt-Institute, Georg-August University, Büsgenweg 4, 37077, G?ttingen, Germany
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| Abstract: | Birch wood (Betula pendula) samples were treated in a thermal regime (140, 160, 180 °C) for 1 h and investigated by means of scanning electron microscopy (SEM). SEM microimages of the wood cross-section were taken from one and the same place before and after the thermal treatment (magnification 100–2,000×). The results of measurements of areas and linear sizes of the birch wood cells show significant changes, which depend on the thermal treatment conditions and the type of the cell: libriform, tracheid, vessel and ray. After the treatment at 180 °C, the integrity of wood morphological structure begins to break up. Voids and cracks are formed between fibres, thus leading to a decline in the mechanical properties of the wood. |
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