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Moisture adsorption of glucomannan and xylan hemicelluloses
ETH Zurich, Switzerland; Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
RISE, Innventia.
Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
ETH Zurich, Switzerland; Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
2016 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 23, no 3, p. 1629-1637Article in journal (Refereed) Published
Abstract [en]

Wood and wood materials are highly sensitive to moisture in the environment. To a large extent this relates to the hygroscopicity of wood hemicelluloses. In order to increase our understanding of the effects of moisture sorption of the major wood hemicelluloses, glucomannan and xylan, model experiments using films of amorphous konjak glucomannan and rye arabinoxylan were conducted. Moisture-induced expansion and stiffness softening were characterized using dynamic mechanical testing. Both hemicelluloses showed a threshold around 5 % of moisture content above which swelling increased whereas the modulus decreased by more than 70 %. FTIR spectra, using H2O and D2O, indicated that even at high RH about 15 % of the hydroxyl groups were not accessible to hydrogen exchange by D2O. For xylan both hydroxyl groups were found to exchange in the same manner while for the glucomannan the O(6)H group seemed to be the most accessible.

Place, publisher, year, edition, pages
2016. Vol. 23, no 3, p. 1629-1637
Keywords [en]
Amorphous films; Cellulose; Deuterium; Fourier transform infrared spectroscopy; Mechanical testing; Sorption; Swelling; Wood, Dynamic mechanical testing; Glucomannan; Hemicellulose; Hydrogen exchange; Moisture adsorption; Weakening; Wood hemicellulose; Xylan, Moisture
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-12623DOI: 10.1007/s10570-016-0944-8Scopus ID: 2-s2.0-84963745718OAI: oai:DiVA.org:ri-12623DiVA, id: diva2:971110
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2019-06-17Bibliographically approved

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