Dry-Jet Wet Spinning of Technical and Textile Filament Fibers from a Solution of Wood Pulp and Waste Cotton in an Ionic Liquid

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hummel, Michael, Assoc. Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.contributor.author Asaadi, Shirin
dc.date.accessioned 2019-09-09T09:01:25Z
dc.date.available 2019-09-09T09:01:25Z
dc.date.issued 2019
dc.identifier.isbn 978-952-60-8695-8 (electronic)
dc.identifier.isbn 978-952-60-8694-1 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/40199
dc.description.abstract This dissertation presents the further development of IONCELL technology for the productionof modified and composite man-made cellulosic fibers using waste and virgin lignocellulosicmaterials. IONCELL technology consists of a dry-jet wet spinning process using an ionic liquid asa polymer solvent. Different structural features of the IONCELL fibers spun from cellulose- [DBNH]OAc solutionwere studied against their mechanical properties with wide- and small-angle scattering techniques.It was observed that the change in crystallite size or orientation does not correlate with anymechanical properties. However, by increasing the draw ratio, the sample crystallinity, amorphousand void orientation, specific surface, and sorption/desorption properties of the fibers changesignificantly. The effect of the addition of lignin and/or xylan to the spinning dope on the fibers' mechanicalproperties and surface chemistry was also studied. The results showed the surface properties canbe fine-tuned by changing the composition of the fibers. In addition, the fibers produced fromcellulose with xylan and/or lignin as an additive showed declined tensile strength. The fibersdeformability increased since these additives contributed to the amorphous parts of the fibers.Moreover, the swelling test indicated the three-component fibers had the least change in theircross-sectional area. Chemical modification in the solution of cellulose and its spinning to acetylated cellulose filamentswas investigated. This study proved the degree of substitution can be adjusted precisely to achievethe desired properties. For instance, cellulose with the degree of substitution values of 0.05–0.75was successfully spun, and fibers reached particularly high tensile strength values (525–750 MPaconditioned and 315–615 MPa wet) and elastic moduli values between 10 and 26 GPa. The IONCELL process was utilized for the chemical upcycling of cotton wastes. Implementing thisprocess, complete and residue-free dissolution of waste cotton and the conversion of this materialinto virgin cellulose fibers with high tensile strength (850 MPa) were achieved. We addressed theproblem that waste cotton is an inhomogeneous feedstock with a broad variation in molecularproperties. In order to reduce and adapt the required degree of polymerization of the cotton waste,either an aqueous acid or an enzymatic treatment was conducted. Alternatively, the cotton wastewas mixed with pre-hydrolysis kraft pulp with a low degree of polymerization to obtain themacromolecular properties necessary for spinning. In addition, we described the physicochemicalproperties of the respective solutions as a key to ensure successful spinning of high-performancefibers. The resulted IONCELL fibers showed significantly better mechanical properties than thecommercially available viscose, Lyocell or virgin cotton fibers, mainly due to the higher totalorientation of the cellulose chains. en
dc.format.extent 87 + app. 93
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 155/2019
dc.relation.haspart [Publication 1]: Asaadi, Shirin; Hummel, Michael; Hellsten, Sanna; Härkäsalmi, Tiina; Ma, Yibo; Michud, Anne; Sixta, Herbert. Renewable highperformance fibers from the chemical recycling of cotton waste utilizing an ionic liquid. Wiley. ChemSusChem, 2016, volume 9, issue 22, page 3250–3258. DOI: 10.1002/cssc.201600680
dc.relation.haspart [Publication 2]: Asaadi, Shirin; Hummel, Michael; Ahvenainen, Patrik; Gubitosi, Marta; Olsson, Ulf; Sixta, Herbert. Structural analysis of Ioncell-F fibres from birch wood. Carbohydrate Polymers, 2018, volume 181, page 893-901. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201904022463.DOI: 10.1016/j.carbpol.2017.11.062
dc.relation.haspart [Publication 3]: Nypelö, Tiina; Asaadi, Shirin; Kneidinger, Gunther; Sixta, Herbert; Konnerth, Johannes. Conversion of wood-biopolymers into macrofibers with tunable surface energy via dry-jet wet-spinning. Cellulose, 2018, volume 25, issue 9, page 5297-5307. Full text in Acris/Aaltodoc: http://urn.fi/URN:NBN:fi:aalto-201810165369. DOI: 10.1007/s10570-018-1902-4
dc.relation.haspart [Publication 4]: Asaadi, Shirin; Kakko, Tia; King, Alistair W.T.; Kilpeläinen, Ilkka; Hummel, Michael; Sixta, Herbert. High-Performance Acetylated Ioncell-F Fibers with Low Degree of Substitution. ACS publications. ACS Sustainable Chemistry & Engineering, 2018, volume 6, issue 7, page 9418–9426. DOI: 10.1021/acssuschemeng.8b01768
dc.subject.other Biotechnology en
dc.subject.other Chemistry en
dc.title Dry-Jet Wet Spinning of Technical and Textile Filament Fibers from a Solution of Wood Pulp and Waste Cotton in an Ionic Liquid en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Biotuotteiden ja biotekniikan laitos fi
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword cellulose en
dc.subject.keyword regenerated cellulose fibers en
dc.subject.keyword cellulose acetate en
dc.subject.keyword ionic liquid en
dc.subject.keyword dry-jet wet spinning en
dc.subject.keyword cotton recycling en
dc.identifier.urn URN:ISBN:978-952-60-8695-8
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Sixta, Herbert, Prof., Aalto University, Department of Bioproducts and Biosystems, Finland
dc.opn Bechtold, Thomas, Prof., University of Innsbruck, Austria
dc.contributor.lab Biorefineries en
dc.rev Hallett, Jason P., Prof., Imperial College London, United Kingdom
dc.rev Coutinho, João A.P., Prof., University of Aveiro, Portugal
dc.date.defence 2019-09-20

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