Coaxial Spinning of All-Cellulose Systems for Enhanced Toughness: Filaments of Oxidized Nanofibrils Sheathed in Cellulose II Regenerated from a Protic Ionic Liquid

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 Et]), a protic ionic liquid (PIL). Coagulation in an acidic water bath resulted in continuous core-shell filaments (CSFs...

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Vydáno v:Biomacromolecules Ročník 21; číslo 2; s. 878
Hlavní autoři: Reyes, Guillermo, Lundahl, Meri J, Alejandro-Martín, Serguei, Arteaga-Pérez, Luis E, Oviedo, Claudia, King, Alistair W T, Rojas, Orlando J
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 10.02.2020
Témata:
Cellulose - analysis
Cellulose - chemical synthesis
Gas Chromatography-Mass Spectrometry - methods
Hydrogels - analysis
Hydrogels - chemical synthesis
Ionic Liquids - analysis
Ionic Liquids - chemical synthesis
Nanofibers - analysis
Nanofibers - chemistry
Tensile Strength
ISSN:1526-4602, 1526-4602
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Shrnutí: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 Et]), 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 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.
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ISSN:1526-4602
1526-4602
DOI:10.1021/acs.biomac.9b01559