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Improved yield of carbon fibres from cellulose and kraft lignin
KTH Royal Institute of Technology, Sweden.
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0002-5212-780x
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.ORCID iD: 0000-0003-4564-2544
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2018 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, no 12, p. 1007-1016Article in journal (Refereed) Published
Abstract [en]

To meet the demand for carbon-fibre-reinforced composites in lightweight applications, cost-efficient processing and new raw materials are sought for. Cellulose and kraft lignin are each interesting renewables for this purpose due to their high availability. The molecular order of cellulose is an excellent property, as is the high carbon content of lignin. By co-processing cellulose and lignin, the advantages of these macromolecules are synergistic for producing carbon fibre (CF) of commercial grade in high yields. CFs were prepared from precursor fibres (PFs) made from 70:30 blends of softwood kraft lignin (SW-KL) and cellulose by dry-jet wet spinning with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) as a solvent. In focus was the impact of the molecular mass of lignin and the type of cellulose source on the CF yield and properties, while membrane-filtrated kraft lignin and cellulose from dissolving kraft pulp and fully bleached paper-grade SW-KP (kraft pulp) served as sources. Under the investigated conditions, the yield increased from around 22% for CF from neat cellulose to about 40% in the presence of lignin, irrespective of the type of SW-KL. The yield increment was also higher relative to the theoretical one for CF made from blends (69%) compared to those made from neat celluloses (48-51%). No difference in the mechanical properties of the produced CF was observed.

Place, publisher, year, edition, pages
2018. Vol. 72, no 12, p. 1007-1016
Keywords [en]
1-ethyl-3-methylimidazolium acetate (EMIMAc), carbon fibre (CF), cellulose, dissolving pulp, dry-jet wet-spun, fractionation, kraft pulp, LignoBoost lignin, molecular mass, softwood kraft lignin, Carbon fibers, Dissolution, Fiber reinforced materials, Fiber reinforced plastics, Ionic liquids, Softwoods, 1-ethyl-3-methylimidazolium acetates, Carbon fibre reinforced composites, Dry jet-wet spinning, High carbon content, Lightweight application, Molecular ordering, Softwood kraft lignins, Lignin
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34571DOI: 10.1515/hf-2018-0028Scopus ID: 2-s2.0-85050958001OAI: oai:DiVA.org:ri-34571DiVA, id: diva2:1238479
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2019-03-06Bibliographically approved

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Olsson, CarinaSedin, MariaJedvert, KerstinSjöholm, Elisabeth

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