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Identifying breach mechanism during air-gap spinning of lignin–cellulose ionic-liquid solutions
RISE - Research Institutes of Sweden, Materials and Production, IVF. Chalmers University of Technology, Sweden.ORCID iD: 0000-0002-2513-4289
RISE - Research Institutes of Sweden, Materials and Production, IVF.ORCID iD: 0000-0003-2893-8554
RISE - Research Institutes of Sweden, Materials and Production, IVF.ORCID iD: 0000-0003-1259-6414
Chalmers University of Technology, Sweden.
2019 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, article id 47800Article in journal (Refereed) Published
Abstract [en]

To be able to produce highly oriented and strong fibers from polymer solutions, a high elongational rate during the fiber-forming process is necessary. In the air-gap spinning process, a high elongational rate is realized by employing a high draw ratio, the ratio between take-up and extrusion velocity. Air-gap spinning of lignin–cellulose ionic-liquid solutions renders fibers that are promising to use as carbon fiber precursors. To further improve their mechanical properties, the polymer orientation should be maximized. However, achieving high draw ratios is limited by spinning instabilities that occur at high elongational rates. The aim of this experimental study is to understand the link between solution properties and the critical draw ratio during air-gap spinning. A maximum critical draw ratio with respect to temperature is found. Two mechanisms that limit the critical draw ratio are proposed, cohesive breach and draw resonance, the latter identified from high-speed videos. The two mechanisms clearly correlate with different temperature regions. The results from this work are not only of value for future work within the studied system but also for the design of air-gap spinning processes in general. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47800.

Place, publisher, year, edition, pages
John Wiley and Sons Inc. , 2019. article id 47800
Keywords [en]
cellulose and other wood products, extrusion, fibers, manufacturing, viscosity and viscoelasticity, Air, Carbon fibers, Cellulose, High speed cameras, Ionic liquids, Lignin, Manufacture, Wood, Carbon fiber precursors, Extrusion velocity, High draw ratios, High-speed video, Solution property, Spinning process, Temperature regions, Viscosity and viscoelasticities, Spinning (fibers)
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-38493DOI: 10.1002/app.47800Scopus ID: 2-s2.0-85063743075OAI: oai:DiVA.org:ri-38493DiVA, id: diva2:1313530
Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-06-18Bibliographically approved

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Bengtsson, JennyJedvert, KerstinKöhnke, Tobias

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