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Dynamic vapour sorption of wood and holocellulose modified with thermosetting resins
Georg-August-University Göttingen, Germany.ORCID iD: 0000-0003-0883-2306
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.ORCID iD: 0000-0002-6909-2025
Georg-August-University Göttingen, Germany.
2016 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 50, no 1, p. 165-178Article in journal (Refereed) Published
Abstract [en]

Micro-veneers of wood and holocellulose (HC) were modified with the thermosetting resins phenol formaldehyde and melamine formaldehyde. The dynamic water vapour sorption of the modified and untreated veneers was studied in a dynamic vapour sorption apparatus to assess the effects of resin modification. The adsorption of wood and HC as well as the desorption of wood was little affected by the modification in the low relative humidity (RH) range but decreased in the RH range above 60–70 %. The desorption isotherm of HC, however, was increased in the RH range of 15–80 % due to modification. Resin modification gradually decreased the EMC ratio of wood and HC and also influenced the moisture increment, equilibrium time and sorption rate in RH range above 50–60 % RH for wood and above 70–80 % RH for HC. HC exhibited a clearly lower hysteresis than wood. Modification of wood slightly reduced hysteresis compared to untreated wood, but modification of HC clearly increased hysteresis about to the same extent as that of wood. This indicates that the stiffening effect of lignin and thermosetting resins reduces the flexibility of the HC matrix, which results in increased hysteresis.

Place, publisher, year, edition, pages
Springer, 2016. Vol. 50, no 1, p. 165-178
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-46720DOI: 10.1007/s00226-015-0765-1ISI: 000367922200011Scopus ID: 2-s2.0-84952987857OAI: oai:DiVA.org:lnu-46720DiVA, id: diva2:860107
Available from: 2015-10-10 Created: 2015-10-10 Last updated: 2017-12-01Bibliographically approved

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Hosseinpourpia, RezaAdamopoulos, Stergios

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