Abstract
Hydrogels of TEMPO-oxidized nanocellulose were stabilized for dry-jet wet spinning using a shell of cellulose dissolved in 1,5-diazabicyclo[4.3.0]non-5-enium propionate ([DBNH][CO 2Et]), a protic ionic liquid (PIL). Coagulation in an acidic water bath resulted in continuous core-shell filaments (CSFs) that were tough and flexible with an average dry (and wet) toughness of ∼11 (2) MJ·m -3 and elongation of ∼9 (14) %. The CSF morphology, chemical composition, thermal stability, crystallinity, and bacterial activity were assessed using scanning electron microscopy with energy-dispersive X-ray spectroscopy, liquid-state nuclear magnetic resonance, Fourier transform infrared spectroscopy, thermogravimetric analysis, pyrolysis gas chromatography-mass spectrometry, wide-angle X-ray scattering, and bacterial cell culturing, respectively. The coaxial wet spinning yields PIL-free systems carrying on the surface the cellulose II polymorph, which not only enhances the toughness of the filaments but facilities their functionalization.
Original language | English |
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Pages (from-to) | 878-891 |
Number of pages | 14 |
Journal | Biomacromolecules |
Volume | 21 |
Issue number | 2 |
Early online date | 2 Jan 2020 |
DOIs | |
Publication status | Published - 10 Feb 2020 |
MoE publication type | A1 Journal article-refereed |
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Equipment
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OtaNano - Nanomicroscopy Center
Janne Ruokolainen (Manager)
Department of Applied PhysicsFacility/equipment: Facility