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Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics

Jonasson, Simon and Bünder, Anne and Das, Oisik and Niittylä, Totte and Oksman, Kristiina (2021). Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics. Cellulose. 28 , 1085-1104
[Journal article]

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Abstract

Cellulose nanofibrils (CNFs) are top-down nanomaterials obtainable from abundant lignocelluloses. Despite recent advances in processing technologies, the effects of variations in the lignocellulose structure and composition on CNF isolation and properties are poorly understood. In this study, we compared the isolation of CNFs from tension wood (TW) and normal wood (NW) from Populus tremula (aspen). The TW has a higher cellulose content, native cellulose fibrils with a larger crystalline diameter, and less lignin than the NW, making it an interesting material for CNF isolation. The wood powders were oxidized directly by 2,2,6,6-tetramethylpiperidin-1-oxyl, and the morphology and mechanical behaviors of the nanofibril suspensions and networks were characterized. The TW was more difficult to fibrillate by both chemical and mechanical means. Larger nanofibrils (5-10 nm) composed of 1.2 nm structures were present in the TW CNFs, whereas the NW samples contained more of thin (1.6 nm) structures, which also comprised 77% of the solid yield compared to the 33% for TW. This difference was reflected in the TW CNF networks as decreased transmittance (15% vs. 50%), higher degree of crystallinity (85.9% vs. 78.0%), doubled toughness (11 MJ/m(3)) and higher elongation at break (12%) compared to NW. The difference was ascribed to greater preservation of the hierarchical, more crystalline microfibril structure, combined with a more cellulose-rich network (84% vs. 70%). This knowledge of the processing, structure, and properties of CNFs can facilitate the breeding and design of wood feedstocks to meet the increasing demand for nanoscale renewable materials.[GRAPHICS].

Authors/Creators:Jonasson, Simon and Bünder, Anne and Das, Oisik and Niittylä, Totte and Oksman, Kristiina
Title:Comparison of tension wood and normal wood for oxidative nanofibrillation and network characteristics
Series Name/Journal:Cellulose
Year of publishing :2021
Volume:28
Page range:1085-1104
Number of Pages:20
Publisher:SPRINGER
ISSN:0969-0239
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
Keywords:Cellulose nanofibril, Nanofibrillation, Fibril network, TEMPO oxidation, Tension wood, Wood properties
URN:NBN:urn:nbn:se:slu:epsilon-p-109245
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-109245
Additional ID:
Type of IDID
DOI10.1007/s10570-020-03556-1
Web of Science (WoS)000588877900001
ID Code:22163
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Genetics and Plant Physiology
Deposited By: SLUpub Connector
Deposited On:09 Feb 2021 07:58
Metadata Last Modified:09 Feb 2021 08:01

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