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

Guillermo Reyes, Meri Lundahl, Serguei Alejandro-Martin, Luis Arteaga-Perez, Claudia Oviedo, Alistair King, Orlando J. Rojas

Research output: Contribution to journalArticleScientificpeer-review

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.

Original languageEnglish
JournalBiomacromolecules
Volume21
Issue number2
Pages (from-to)878-891
Number of pages14
ISSN1525-7797
DOIs
Publication statusPublished - Feb 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • CYTOTOXICITY
  • DISSOLUTION
  • FILMS
  • IONCELL-F FIBERS
  • NANOCELLULOSE
  • NANOCRYSTALS
  • NATIVE CELLULOSE
  • OXIDATION
  • PAPER
  • WATER
  • 116 Chemical sciences

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