Coaxial spinning of all-cellulose systems for enhanced toughness : filaments of oxidized nanofibrils sheathed in cellulose II regenerated from a protic ionic liquid

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Reyes , G , Lundahl , M , Alejandro-Martin , S , Arteaga-Perez , L , Oviedo , C , King , A & Rojas , O J 2020 , ' Coaxial spinning of all-cellulose systems for enhanced toughness : filaments of oxidized nanofibrils sheathed in cellulose II regenerated from a protic ionic liquid ' , Biomacromolecules , vol. 21 , no. 2 , pp. 878-891 . https://doi.org/10.1021/acs.biomac.9b01559

Title: Coaxial spinning of all-cellulose systems for enhanced toughness : filaments of oxidized nanofibrils sheathed in cellulose II regenerated from a protic ionic liquid
Author: Reyes, Guillermo; Lundahl, Meri; Alejandro-Martin, Serguei; Arteaga-Perez, Luis; Oviedo, Claudia; King, Alistair; Rojas, Orlando J.
Contributor: University of Helsinki, Department of Chemistry
Date: 2020-02
Language: eng
Number of pages: 14
Belongs to series: Biomacromolecules
ISSN: 1525-7797
URI: http://hdl.handle.net/10138/314552
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][CO2Et]), 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 similar to 11 (2) MJ.m(-3) and elongation of similar to 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.
Subject: CYTOTOXICITY
DISSOLUTION
FILMS
IONCELL-F FIBERS
NANOCELLULOSE
NANOCRYSTALS
NATIVE CELLULOSE
OXIDATION
PAPER
WATER
116 Chemical sciences
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