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Water vapour sorption properties of thermally modified and pressurised hot-water-extracted wood powder
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials. Lahti Univ Appl Sci, Fac Technol, Mukkulankatu 19, Lahti 15101, Finland.ORCID iD: 0000-0001-8514-5409
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-7250-8693
Aalto Univ, Dept Bioprod & Biosyst, POB 16300, Aalto 00076, Finland.
Aalto Univ, Dept Bioprod & Biosyst, POB 16300, Aalto 00076, Finland.
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2019 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 73, no 12, p. 1059-1068Article in journal (Refereed) Published
Abstract [en]

The objective of the study was to investigate the water vapour sorption behaviour of thermally modified (TM) wood powder, e.g. ground wood prepared from waste streams of TM solid wood, and wood powder that was extracted in pressurised hot water. Solid spruce wood was TM in steam conditions (210°C for 3 h), milled and hot-water-extracted (HWE) at elevated pressure (140°C for 1 h). The results evidence that the hot-water extraction reduced the water sorption and the accessible hydroxyl group concentration by the removal of amorphous carbohydrates. In contrast, the enhanced cross-linking of the cell wall matrix and the annealing of amorphous matrix polymers during thermal modification reduced the sorption behaviour of wood additionally, without further reducing the hydroxyl accessibility. These additional effects of thermal modification were at least partially cancelled by hot-water extraction. The results bring novel insights into the mechanisms that reduce the water vapour sorption of wood by compositional and structural changes induced by heating.

Place, publisher, year, edition, pages
De Gruyter , 2019. Vol. 73, no 12, p. 1059-1068
Keywords [en]
carbohydrate analysis, deuterium exchange, dynamic vapour sorption, hot-water extraction, thermal modification, Carbohydrates, Crosslinking, Sorption, Water vapor, Wood, Dynamic vapour sorptions, Hot water extraction, Extraction
National Category
Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263273DOI: 10.1515/hf-2018-0301ISI: 000497967800002Scopus ID: 2-s2.0-85069753584OAI: oai:DiVA.org:kth-263273DiVA, id: diva2:1368024
Note

QC 20191105

Available from: 2019-11-05 Created: 2019-11-05 Last updated: 2019-12-12Bibliographically approved

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Lillqvist, KristiinaKällbom, Susanna

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