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Creep properties of compression wood fibers
Nanjing Forestry University, China; Hunan Collaborative Innovation Center for Effective Utilizing of Wood and Bamboo Resources, China.
RISE Research Institutes of Sweden, Bioeconomy and Health.ORCID iD: 0000-0003-3534-1107
Hunan Collaborative Innovation Center for Effective Utilizing of Wood and Bamboo Resources, China.
Nanjing Forestry University, China; Hunan Collaborative Innovation Center for Effective Utilizing of Wood and Bamboo Resources, China.
2020 (English)In: Wood Science and Technology, ISSN 0043-7719, E-ISSN 1432-5225, Vol. 54, p. 1497-1510Article in journal (Refereed) Published
Abstract [en]

To achieve efficient utilization of compression wood (CW), a deeper insight into the creep behavior of CW is necessary. In particular, the involvement of lignin for the creep behavior of CW needs to be better understood. In the present paper, wood fibers and slices from CW and normal wood were studied at both high constant humidity and cyclic 30–80% RH conditions. The micromechanical deformation explored by FTIR confirmed that in CW, lignin participated in the stress transfer during creep measurements. For all types of materials, the creep strain rate at constant and cyclic humidity conditions was linearly related to the applied load level. For single CW fibers, the creep rates were higher at a given load for native CW fibers compared to holocellulose CW fibers, due to the lower relative cellulose content. The CW fibers, with a microfibril angle of around 45°, were found to exhibit a greater creep rate during moisture cycling as compared to the higher but constant humidity level, i.e., a mechano-sorptive behavior. However, the mechano-sorptive effect, i.e., the ratio between the creep rates at constant and cyclic humidity, was only slightly higher for the CW holocellulose fibers as compared to the native CW fibers, indicating that the lignin most probably does not contribute to the mechano-sorptive effect. 

Place, publisher, year, edition, pages
Springer , 2020. Vol. 54, p. 1497-1510
Keywords [en]
Fibers, Lignin, Strain rate, Wood products, Cellulose content, Compression woods, Creep measurement, Creep strain rate, Humidity conditions, Micro-mechanical deformations, Microfibril angles, Moisture cycling, Creep
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-48902DOI: 10.1007/s00226-020-01221-1Scopus ID: 2-s2.0-85090867337OAI: oai:DiVA.org:ri-48902DiVA, id: diva2:1469798
Note

Funding details: National Key Research and Development Program of China, 2017YFD0600202; Funding details: China Scholarship Council, CSC; Funding text 1: National Key Research and Development Program of China (2017YFD0600202).; Funding text 2: Hui Peng has a fellowship from the China Scholarship Council (CSC). The authors wish to thank Liang Zhou (Anhui Agricultural University, China) for providing the wood samples. Dr. Jasna S. Stevanic RISE/Innventia AB, Sweden, is acknowledged for technical support with the FTIR measurements.

Available from: 2020-09-22 Created: 2020-09-22 Last updated: 2021-01-12Bibliographically approved

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Salmen, Lennart

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