Coaxial Spinning of All-Cellulose Systems for Enhanced Toughness: Filaments of Oxidized Nanofibrils Sheathed in Cellulose II Regenerated from a Protic Ionic Liquid
- 2 January 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in Biomacromolecules
- Vol. 21 (2), 878-891
- https://doi.org/10.1021/acs.biomac.9b01559
Abstract
Hydrogels of TEMPO-oxidized nanocellulose (TO-CNF) 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][CO2Et]), a protic ionic liquid (PIL). Coagulation in an acidic water bath resulted in continuous core-shell filaments (CSF) that were tough and flexible: average dry (and wet) toughness of ~11 (2) MJ.m-3 and elongation of ~9 (14) %. 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.Keywords
Funding Information
- Universidad del B??o-B??o (FAPEI)
- Becas Chile for postdoctoral studies
- Universidad del Bio Bio proyecto regular (DIUBB 192212 2/R)
- Fondequip Chile (170077)
- WTF-Click-Nano (311255)
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