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Microfibrillated lignocellulose (MFLC) and nanopaper films from unbleached kraft softwood pulp
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
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2020 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Abstract: Microfibrillated cellulose (MFC) is an important industrial nanocellulose product and material component. New MFC grades can widen the materials property range and improve product tailoring. Microfibrillated lignocellulose (MFLC) is investigated, with the hypothesis that there is an optimum in lignin content of unbleached wood pulp fibre with respect to nanofibril yield. A series of kraft fibres with falling Kappa numbers (lower lignin content) was prepared. Fibres were beaten and fibrillated into MFLC by high-pressure microfluidization. Nano-sized fractions of fibrils were separated using centrifugation. Lignin content and carbohydrate analysis, total charge, FE-SEM, TEM microscopy and suspension rheology characterization were carried out. Fibres with Kappa number 65 (11% lignin) combined high lignin content with ease of fibrillation. This confirms an optimum in nanofibril yield as a function of lignin content, and mechanisms are discussed. MFLC from these fibres contained a 40–60 wt% fraction of nano-sized fibrils with widths in the range of 2.5–70 nm. Despite the large size distribution, data for modulus and tensile strength of MFLC films with 11% lignin were as high as 14 GPa and 240 MPa. MFLC films showed improved water contact angle of 84–88°, compared to neat MFC films (< 50°). All MFLC films showed substantial optical transmittance, and the fraction of haze scattering strongly correlated with defect content in the form of coarse fibrils. Graphic abstract: [Figure not available: see fulltext.] © 2019, The Author(s).

Place, publisher, year, edition, pages
Springer , 2020.
Keywords [en]
Fibrillation, Lignin, Lignin-containing cellulose nanofibril (LCNF), Mechanical properties, Nanocellulose, Cellulose, Contact angle, Fibers, Nanofibers, Pulp beating, Tensile strength, Unbleached pulp, Carbohydrate analysis, High pressure microfluidization, Material components, Microfibrillated cellulose (MFC), Nanofibril, Suspension rheology, Water contact angle, Wood
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43372DOI: 10.1007/s10570-019-02934-8Scopus ID: 2-s2.0-85077400087OAI: oai:DiVA.org:ri-43372DiVA, id: diva2:1389307
Note

Funding details: Stiftelsen för Miljöstrategisk Forskning, MISTRA; Funding details: Kungliga Tekniska Högskolan, KTH; Funding details: Wallenberg Wood Science Center, WWSC; Funding details: Stiftelsen för Strategisk Forskning, SSF; Funding text 1: Funding was provided by Stiftelsen för Strategisk Forskning (Grant No. FID15-0115).; Funding text 2: We would like to kindly acknowledge Lars Norberg for helping with Sprout-Waldron refining, Hui Chen for the help with optical transmittance, and Dr Per A. Larsson and Dr Göksu Cinar Ciftci for help with the fractionation set-up. Ann-Marie Runebjörk and Åsa Engström are also acknowledged for their support in the nanocellulose lab at RISE. The funding support of this work by the Swedish Foundation for Strategic Research, STFI association of interested parties and Wallenberg Wood Science Center, and open access funding provided by Royal Institute of Technology are gratefully acknowledged. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Available from: 2020-01-29 Created: 2020-01-29 Last updated: 2020-01-29Bibliographically approved

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