TY - JOUR
T1 - Coaxial Spinning of All-Cellulose Systems for Enhanced Toughness
T2 - Filaments of Oxidized Nanofibrils Sheathed in Cellulose II Regenerated from a Protic Ionic Liquid
AU - Reyes, Guillermo
AU - Lundahl, Meri J.
AU - Alejandro-Martín, Serguei
AU - Arteaga-Pérez, Luis E.
AU - Oviedo, Claudia
AU - King, Alistair W.T.
AU - Rojas, Orlando J.
N1 - Funding Information:
A.W.T.K. acknowledges the Academy of Finland for funding under the project “WTF-Click-Nano” (no. 311255). G.R. acknowledges the contribution of Becas Chile for supporting the postdoctoral studies at Aalto University, regular research project DIUBB 192212 2/R, and FAPEI UBB. The authors acknowledge the financial support of KAUTE—The Finnish Science Foundation for Technology and Economics, as well as the provision of facilities and technical support by Aalto University at OtaNano—Nanomicroscopy Center (Aalto-NMC). The authors also wish to acknowledge the Chilean National Commission for Scientific and Technological Research (Fondequip grant no. 170077).
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/2/10
Y1 - 2020/2/10
N2 - 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 ∼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.
AB - 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 ∼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.
UR - http://www.scopus.com/inward/record.url?scp=85078747278&partnerID=8YFLogxK
U2 - 10.1021/acs.biomac.9b01559
DO - 10.1021/acs.biomac.9b01559
M3 - Article
C2 - 31895545
AN - SCOPUS:85078747278
VL - 21
SP - 878
EP - 891
JO - Biomacromolecules
JF - Biomacromolecules
SN - 1525-7797
IS - 2
ER -