Nanocellulose from fractionated sulfite wood pulp
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ORIGINAL RESEARCH
Nanocellulose from fractionated sulfite wood pulp Armin Winter . Benjamin Arminger . Stefan Veigel . Claudia Gusenbauer . Wolfgang Fischer . Melanie Mayr . Wolfgang Bauer . Wolfgang Gindl-Altmutter
Received: 9 October 2019 / Accepted: 29 August 2020 Ó The Author(s) 2020
Abstract Fine fibre fractions in wood pulp may contribute to advantageous paper properties, but in some instances their removal from pulp may be beneficial to the production process of certain paper grades. In order to study the suitability of fine fibre fractions for the production of nanocellulose as an alternative use option, sulfite pulp was fractionated and homogenised, and cellulose nanopapers were produced. Characterisation revealed that fine fibre fractions were more easily homogenised than long
fibres. Aqueous suspensions of nanocellulose produced from fines showed remarkably reduced viscosity compared to nanocellulose derived from long fibres. Nanopapers produced from all nanocellulose variants showed roughly similar mechanical performance. Only nanopaper produced from primary finesderived nanocellulose deviated in that it showed a comparably high modulus of elasticity at a low strain at failure. Overall, fine fibre fractions separated from wood pulp were found to be highly suitable for nanocellulose production.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10570-020-03428-8) contains supplementary material, which is available to authorized users. A. Winter (&) S. Veigel C. Gusenbauer W. Gindl-Altmutter Department of Material Sciences and Process Engineering, Institute of Wood Technology and Renewable Materials, University of Natural Resources and Life Sciences Vienna, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria e-mail: [email protected]
M. Mayr Mondi GmbH, Theresiensthalstr. 50, 3363 Hausmening, Austria W. Bauer Institute of Bioproducts and Paper Technology, NAWI Graz, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria
B. Arminger Wood K Plus – Competence Centre for Wood Composites and Wood Chemistry, Konrad-Lorenz-Straße 24, 3430 Tulln, Austria W. Fischer Sappi Paper GmbH, Brucker Str. 21, 8108 Gratkorn, Austria
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Cellulose
Keywords Cellulose nanofibrils Primary/ secondary fines Sulfite pulp Microfibrillation Morphology Rheology
Introduction Since more than one decade, nanocellulose has been a topic of high relevance to the scientific community and the pulp and paper industrial sector (Charreau et al. 2013; Dufresne 2013; Eichhorn et al. 2010; Klemm et al. 2018; Klemm et al. 2011; Li et al. 2015; Oksman et al. 2016; Thomas et al. 2018). The term nanocellulose comprises the sub-groups of cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs). While the major processing step in CNF production is mechanical fibrillation of cellulosic raw materials to high-aspect ratio nanofibres with diameters \ 100 nm, the key process in CNC synthesis involves the digestion of non-cry
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