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Lignin-based carbon fiber: effect of softwood kraft lignin separation method on multifilament melt-spinning performance and conversion
Baker Consulting, USA.
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.ORCID iD: 0000-0003-4564-2544
Södra skogsägarna ekonomisk förening, Sweden.
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2019 (English)In: 20th International symposium on wood, fiber, and pulping chemistry, 2019Conference paper, Published paper (Other academic)
Abstract [en]

A reference lignin separated from an industrial softwood kraft black liquor via an improved LignoBoost process was compared to four other lignins derived from the same liquor. The four lignins were produced by using a) pH-fractionation within the LignoBoost process, b) ultrafiltration of black liquor prior to the LignoBoost process, and c) solvent leaching of the reference lignin using methanol and d) ethanol.Lignin compositional characteristics and thermal properties were compared, and monofilament extrusion used to assess their potential for successful melt spinning at the 24 filament scale. The lignin prepared by ethanol leaching of the reference lignin was found to be most appropriate for potential pilot scale fibre production. This was owing to a high purity, lower comparative glass transition temperature (Tg), and good spinning performance.Thermal pretreatments of the ethanol leached lignin gave a selection of enhanced lignins which were characterized for comparison, and melt spun on pilot multifilament equipment. The enhanced lignins could be continuously melt spun giving filaments with diameters as low as 10 μm and with minimal defects. Conversion of selected filaments provided carbon fibres with a tensile strength of 1259 ± 159 MPa, tensile modulus of 67 ± 3 GPa and diameter of 7.3 ± 0.5 μm.

Place, publisher, year, edition, pages
2019.
Keywords [en]
lignin, carbon fibre, lignoboost, ultrafiltration, black liquor, leaching, methanol, ethanol, softwood, kraft lignin, melt spinning
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-40762OAI: oai:DiVA.org:ri-40762DiVA, id: diva2:1371249
Conference
20th International symposium on wood, fiber, and pulping chemistry, 9-11 September 2019, Tokyo
Funder
EU, Horizon 2020, 667501Available from: 2019-11-19 Created: 2019-11-19 Last updated: 2019-11-22Bibliographically approved

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Sedin, Maria

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