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Shear and extensional rheology of aqueous suspensions of cellulose nanofibrils for biopolymer-assisted filament spinning
Aalto University, Finland.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.
Aalto University, Finland.
RISE - Research Institutes of Sweden, Bioscience and Materials, Agrifood and Bioscience.ORCID iD: 0000-0003-0310-4465
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2018 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 109, p. 367-378Article in journal (Refereed) Published
Abstract [en]

The shear and extensional rheology of aqueous suspensions of cellulose nanofibrils (CNF) were investigated under dynamic and steady flow fields. The results were compared to those for two biopolymer solutions, cellulose acetate, CA, and guar gum, GG. Wet-spinning experiments were conducted for each system and the outcome related to the respective rheological profile. The spinnability of the system correlated with strong Newtonian and viscous responses under shear as well as long breakup time in capillary breakup experiments. CA solution was the most spinnable, also displaying the strongest Newtonian liquid behavior and the longest capillary breakup time. In contrast, the most shear-thinning and elastic CNF suspension showed instant capillary breakup and was considerably less spinnable. This is due to the limited entanglement between the rigid cellulose fibrils. In order to enable continuous wet-spinning of CNF without filament breakup, GG and CA were used as carrier components in coaxial spinning. The shear and extensional rheology of the system is discussed considering both as supporting polymers.

Place, publisher, year, edition, pages
2018. Vol. 109, p. 367-378
Keywords [en]
Cellulose nanofibrils, Extension, Hydrogels, Nanocellulose, Shear, Wet spinning, Biomolecules, Cellulose, Elasticity, Nanofibers, Newtonian liquids, Shear thinning, Shearing, Steady flow, Suspensions (fluids), Aqueous suspensions, Cellulose acetates, Cellulose fibrils, Extensional rheology, Rheological profiles, Shear flow
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36565DOI: 10.1016/j.eurpolymj.2018.10.006Scopus ID: 2-s2.0-85054652679OAI: oai:DiVA.org:ri-36565DiVA, id: diva2:1270499
Note

 Funding details: Academy of Finland; Funding details: Aalto-Yliopisto; Funding details: European Research Council, ERC; Funding details: Jenny ja Antti Wihurin Rahasto; Funding details: 788489; Funding details: Israeli Centers for Research Excellence, I-CORE, 264677;

Available from: 2018-12-13 Created: 2018-12-13 Last updated: 2019-01-22Bibliographically approved

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