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Mass transport and yield during spinning oflignin-cellulose carbon fiber precursors
RISE - Research Institutes of Sweden, Bioeconomy, Biobased Materials. Chalmers University of Technology, Sweden.ORCID iD: 0000-0002-2513-4289
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0003-2893-8554
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0002-6498-7022
RISE - Research Institutes of Sweden, Swerea, Swerea IVF.ORCID iD: 0000-0003-1259-6414
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2019 (English)In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Lignin, a substance considered as a residue in biomass and ethanol production, has been identified as a renewable resource suitable for making inexpensive carbon fibers (CFs), which would widen the range of possible applications for light-weight CFs reinforced composites. Wet spinning of lignin-cellulose ionic liquid solutions is a promising method for producing lignin-based CFs precursors. However, wet-spinning solutions containing lignin pose technical challenges that have to be solved to enable industrialization. One of these issues is that a part of the lignin leaches into the coagulation liquid, which reduces yield and might complicate solvent recovery. In this work, the mass transport during coagulation is studied in depth using a model system and trends are confirmed with spinning trials. It was discovered that during coagulation, efflux of ionic liquid is not hindered by lignin concentration in solution and the formed cellulose network will enclose soluble lignin. Consequently, a high total concentration of lignin and cellulose in solution is advantageous to maximize yield. This work provides a fundamental understanding on mass transport during coagulation of lignin-cellulose solutions, crucial information when designing new solution-based fiber forming processes.

Place, publisher, year, edition, pages
2019.
Keywords [en]
biomass; carbon fiber; ionic liquids; lignin; wet spinning
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:ri:diva-37686DOI: 10.1515/hf-2018-0246OAI: oai:DiVA.org:ri-37686DiVA, id: diva2:1284206
Available from: 2019-01-31 Created: 2019-01-31 Last updated: 2019-02-08Bibliographically approved

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Jedvert, KerstinHedlund, ArturKöhnke, Tobias

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