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Publikationer (10 of 10) Visa alla publikationer
Bengtsson, A., Bengtsson, J., Sedin, M. & Sjöholm, E. (2019). Carbon Fibers from Lignin-Cellulose Precursors: Effect of Stabilization Conditions. ACS Sustainable Chemistry and Engineering, 7(9), 8440-8448
Öppna denna publikation i ny flik eller fönster >>Carbon Fibers from Lignin-Cellulose Precursors: Effect of Stabilization Conditions
2019 (Engelska)Ingår i: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, nr 9, s. 8440-8448Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

There is an increasing demand for lightweight composites reinforced with carbon fibers (CFs). Due to its high availability and carbon content, kraft lignin has gained attention as a potential low-cost CF precursor. CFs with promising properties can be made from flexible dry-jet wet spun precursor fibers (PFs) from blends (70:30) of softwood kraft lignin and fully bleached softwood kraft pulp. This study focused on reducing the stabilization time, which is critical in CF manufacturing. The impact of stabilization conditions on chemical structure, yield, and mechanical properties was investigated. It was possible to reduce the oxidative stabilization time of the PFs from about 16 h to less than 2 h, or even omitting the stabilization step, without fusion of fibers. The main reactions involved in the stabilization stage were dehydration and oxidation. The results suggest that the isothermal stabilization at 250 °C override the importance of having a slow heating rate. For CFs with a commercial diameter, stabilization of less than 2 h rendered in tensile modulus 76 GPa and tensile strength 1070 MPa. Impregnation with ammonium dihydrogen phosphate significantly increased the CF yield, from 31-38 to 46-50 wt %, but at the expense of the mechanical properties.

Ort, förlag, år, upplaga, sidor
American Chemical Society, 2019
Nyckelord
Ammonium dihydrogen phosphate, Lignin, Mechanical properties, Carbon fibers, Kraft pulp, Reinforced plastics, Softwood, Spinning, Tensile strength, Textile blends, Bleached softwood kraft pulp, Cellulose precursor, Dry jet-wet spinning, Lightweight composites, Oxidative stabilization, Softwood kraft lignin, Stabilization
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:ri:diva-38937 (URN)10.1021/acssuschemeng.9b00108 (DOI)2-s2.0-85065403539 (Scopus ID)
Forskningsfinansiär
Energimyndigheten
Tillgänglig från: 2019-06-03 Skapad: 2019-06-03 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Bengtsson, J., Jedvert, K., Köhnke, T. & Theliander, H. (2019). Identifying breach mechanism during air-gap spinning of lignin–cellulose ionic-liquid solutions. Journal of Applied Polymer Science, Article ID 47800.
Öppna denna publikation i ny flik eller fönster >>Identifying breach mechanism during air-gap spinning of lignin–cellulose ionic-liquid solutions
2019 (Engelska)Ingår i: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, artikel-id 47800Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
John Wiley and Sons Inc., 2019
Nyckelord
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)
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-38493 (URN)10.1002/app.47800 (DOI)2-s2.0-85063743075 (Scopus ID)
Tillgänglig från: 2019-05-03 Skapad: 2019-05-03 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Bengtsson, J., Jedvert, K., Hedlund, A., Köhnke, T. & Theliander, H. (2019). Mass transport and yield during spinning oflignin-cellulose carbon fiber precursors. Holzforschung, 73(5), 509-516
Öppna denna publikation i ny flik eller fönster >>Mass transport and yield during spinning oflignin-cellulose carbon fiber precursors
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2019 (Engelska)Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 73, nr 5, s. 509-516Artikel i tidskrift (Refereegranskat) Published
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.

Nyckelord
biomass; carbon fiber; ionic liquids; lignin; wet spinning
Nationell ämneskategori
Materialkemi
Identifikatorer
urn:nbn:se:ri:diva-37686 (URN)10.1515/hf-2018-0246 (DOI)
Tillgänglig från: 2019-01-31 Skapad: 2019-01-31 Senast uppdaterad: 2019-07-01Bibliografiskt granskad
Bengtsson, J., Jedvert, K., Köhnke, T. & Theliander, T. (2018). Coagulation of dry-jet wet-spun lignin-based carbon fibre precursors. In: Proceedings of the 15th European workshop on lignocellulosics and pulp: . Paper presented at 15th European workshop on lignocellulosics and pulp, Aveiro, June 26-29 (pp. 123-126).
Öppna denna publikation i ny flik eller fönster >>Coagulation of dry-jet wet-spun lignin-based carbon fibre precursors
2018 (Engelska)Ingår i: Proceedings of the 15th European workshop on lignocellulosics and pulp, 2018, s. 123-126Konferensbidrag, Publicerat paper (Refereegranskat)
Nationell ämneskategori
Textil-, gummi- och polymermaterial
Identifikatorer
urn:nbn:se:ri:diva-34842 (URN)
Konferens
15th European workshop on lignocellulosics and pulp, Aveiro, June 26-29
Tillgänglig från: 2018-08-15 Skapad: 2018-08-15 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Bengtsson, A., Bengtsson, J., Olsson, C., Sedin, M., Jedvert, K., Theliander, H. & Sjöholm, E. (2018). Improved yield of carbon fibres from cellulose and kraft lignin. Holzforschung, 72(12), 1007-1016
Öppna denna publikation i ny flik eller fönster >>Improved yield of carbon fibres from cellulose and kraft lignin
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2018 (Engelska)Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, nr 12, s. 1007-1016Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
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
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-34571 (URN)10.1515/hf-2018-0028 (DOI)2-s2.0-85050958001 (Scopus ID)
Tillgänglig från: 2018-08-13 Skapad: 2018-08-13 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Bengtsson, J., Olsson, C., Köhnke, T. & Bialik, E. (2017). Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system. In: Cellulosic material properties and industrial potential: Final meeting in COST FP1205. Paper presented at Final meeting in COST FP1205, Cellulosic material Properties and industrial potential, Stockholm, March 7-9.
Öppna denna publikation i ny flik eller fönster >>Elucidating the effect of non-solvents on the TBAAc/DMSO-cellulosesolvent system
2017 (Engelska)Ingår i: Cellulosic material properties and industrial potential: Final meeting in COST FP1205, 2017Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Nationell ämneskategori
Materialteknik
Identifikatorer
urn:nbn:se:ri:diva-30160 (URN)
Konferens
Final meeting in COST FP1205, Cellulosic material Properties and industrial potential, Stockholm, March 7-9
Tillgänglig från: 2017-08-01 Skapad: 2017-08-01 Senast uppdaterad: 2019-06-27Bibliografiskt granskad
Bengtsson, J., Olsson, C., Hedlund, A., Köhnke, T. & Bialik, E. (2017). Understanding the Inhibiting Effect of Small-Molecule Hydrogen Bond Donors on the Solubility of Cellulose in Tetrabutylammonium Acetate/DMSO. Journal of Physical Chemistry B, 121(50), 11241-11248
Öppna denna publikation i ny flik eller fönster >>Understanding the Inhibiting Effect of Small-Molecule Hydrogen Bond Donors on the Solubility of Cellulose in Tetrabutylammonium Acetate/DMSO
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2017 (Engelska)Ingår i: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 121, nr 50, s. 11241-11248Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Certain ionic liquids are powerful cellulose solvents, but tend to be less effective when small-molecule hydrogen bond donors are present. This is generally attributed to competition with cellulose for hydrogen bonding opportunities to the anion of the ionic liquid. We show that the solubility of cellulose in dimethyl sulfoxide solutions of tetrabutylammonium acetate is less strongly affected by water than by ethanol on a molar basis, contrary to what can be expected based on hydrogen bond stoichiometry. Molecular dynamics simulations indicate that the higher tolerance to water is due to water-cellulose interactions that improves solvation of cellulose and, thereby, marginally favors dissolution. Through Kirkwood-Buff theory we show that water, but not ethanol, improves the solvent quality of DMSO and partly compensates for the loss of acetate-cellulose hydrogen bonds.

Nyckelord
Cellulose, Dimethyl sulfoxide, Ethanol, Ionic liquids, Molecular dynamics, Molecules, Organic solvents, Solubility, Cellulose hydrogen bonds, Cellulose solvent, Hydrogen bond donors, Inhibiting effect, Molecular dynamics simulations, Small molecules, Solvent quality, Tetrabutylammonium acetates, Hydrogen bonds
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-33042 (URN)10.1021/acs.jpcb.7b08501 (DOI)2-s2.0-85037599708 (Scopus ID)
Tillgänglig från: 2018-01-11 Skapad: 2018-01-11 Senast uppdaterad: 2019-06-27Bibliografiskt granskad
Olsson, C., Idström, A., Bengtsson, J. & Köhnke, T. (2016). Coagulation of cellulose solutions and its effect on material properties. In: Proceedings of the 14th European workshop on lignocellulosics and pulp: . Paper presented at 14th European workshop on lignocellulosics and pulp, June 28 - July 1, 2016, Autrans, France.
Öppna denna publikation i ny flik eller fönster >>Coagulation of cellulose solutions and its effect on material properties
2016 (Engelska)Ingår i: Proceedings of the 14th European workshop on lignocellulosics and pulp, 2016Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:ri:diva-30226 (URN)
Konferens
14th European workshop on lignocellulosics and pulp, June 28 - July 1, 2016, Autrans, France
Tillgänglig från: 2017-08-07 Skapad: 2017-08-07 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Bengtsson, J., Olsson, C., Idström, A. & Köhnke, T. (2016). Impact of non-solvents in the tetrabutylammonium acetate: dimethyl sulfoxide-cellulose system. In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives: . Paper presented at 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden (pp. 19-22).
Öppna denna publikation i ny flik eller fönster >>Impact of non-solvents in the tetrabutylammonium acetate: dimethyl sulfoxide-cellulose system
2016 (Engelska)Ingår i: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, s. 19-22Konferensbidrag, Muntlig presentation med publicerat abstract (Övrigt vetenskapligt)
Abstract [en]

This work examines the potential of tetrabutylammonium acetate: dimethyl sulfoxide (TBAAc:DMSO) as a solvent used in a process for producing man-made cellulose fibers. The tolerance towards nonsolvents is an important step to evaluate the recyclability of the solvent. TBAAc:DMSO was in this work further confirmed to be an efficient solvent for cellulose. Non-solvent tolerance depended on cellulose concentration, TBAAc:DMSO ratio and type of non-solvent. There was no significant change in mechanical properties for filaments regenerated from solutions containing 2 wt% non-solvent compared to those spun from virgin solvent. With 4 wt% ethanol present in solution very brittle filaments were produced, not suitable for use as textile fibers.

Nationell ämneskategori
Pappers-, massa- och fiberteknik
Identifikatorer
urn:nbn:se:ri:diva-30205 (URN)
Konferens
7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, November 15-16, 2016, Örnsköldsvik, Sweden
Tillgänglig från: 2017-08-04 Skapad: 2017-08-04 Senast uppdaterad: 2019-06-24Bibliografiskt granskad
Hiller, C., Dolff, C., Hasselaar, E. & Bengtsson, J. (2014). LET’S TALK ABOUT ENERGY. How to communicate energy issues to tenants (ed.). Paper presented at .
Öppna denna publikation i ny flik eller fönster >>LET’S TALK ABOUT ENERGY. How to communicate energy issues to tenants
2014 (Engelska)Rapport (Refereegranskat)
Förlag
s. 28
Serie
Beem-up rapport. EU FP7
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:ri:diva-5621 (URN)18838 (Lokalt ID)18838 (Arkivnummer)18838 (OAI)
Tillgänglig från: 2016-09-08 Skapad: 2016-09-08 Senast uppdaterad: 2019-06-18Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-2513-4289

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