期刊
CARBOHYDRATE POLYMERS
卷 115, 期 -, 页码 207-214出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.08.040
关键词
Cell wall; Hygro-mechanical steam treatment; Earlywood; Latewood; Biopolymer components
资金
- Wallenberg Wood Science Center (WWSC) of the Royal Institute of Technology (KTH) of Sweden
- Chinese National Natural Science Foundation [31370559]
- China Scholarship Council (CSC)
- COST (European Cooperation in the field of Scientific and Technical Research) Action [FP0802]
The effects of compression combined with steam treatment (CS-treatment), i.e. a hygro-mechanical steam treatment on Spruce wood were studied on a cell-structure level to understand the chemical and physical changes of the secondary cell wall occurring under such conditions. Specially, imaging FT-IR microscopy, nanoindentation and dynamic vapour absorption were used to track changes in the chemical structure, in micromechanical and hygroscopic properties. It was shown that CS-treatment resulted in different changes in morphological, chemical and physical properties of the cell wall, in comparison with those under pure steam treatment. After CS-treatment, the cellular structure displayed significant deformations, and the biopolymer components, e.g. hemicellulo se and lignin, were degraded, resulting in decreased hygroscopicity and increased mechanical properties of the wood compared to both untreated and steam treated wood. Moreover, CS-treatment resulted in a higher degree of degradation especially in earlywood compared to a more uniform behaviour of wood treated only by steam. (C) 2014 Elsevier Ltd. All rights reserved.
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