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Changes of wood cell walls in response to hygro-mechanical steam treatment
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center. Innventia AB, Sweden .
KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.
2015 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 115, 207-214 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 115, 207-214 p.
Keyword [en]
Cell wall, Hygro-mechanical steam treatment, Earlywood, Latewood, Biopolymer components
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-158371DOI: 10.1016/j.carbpol.2014.08.040ISI: 000344869800028Scopus ID: 2-s2.0-84907101350OAI: oai:DiVA.org:kth-158371DiVA: diva2:780930
Note

QC 20150115

Available from: 2015-01-15 Created: 2015-01-07 Last updated: 2017-12-05Bibliographically approved

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