Exploring Large Ductility in Cellulose Nanopaper Combining High Toughness and Strength

Feng Chen, Wenchao Xiang, Daisuke Sawada, Long Bai, Michael Hummel, Herbert Sixta, Tatiana Budtova*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Cellulose nanopaper is a strong lightweight material made from renewable resources with a wide range of potential applications, from membranes to electronic displays. Most studies on nanopaper target high mechanical strength, which compromises ductility and toughness. Herein, we demonstrate the fabrication of highly ductile and tough cellulose nanopaper via mechanical fibrillation of hemicellulose-rich wood fibers and dispersion of the obtained cellulose nanofibrils (CNFs) in an ionic liquid (IL)–water mixture. This treatment allows hemicellulose swelling, which leads to dissociation of CNF bundles into highly disordered long flexible fibrils and the formation of a nanonetwork as supported by cryogenic transmission electron microscopy (cryo-TEM) imaging. Rheology of the suspensions shows a 300-fold increase in storage and loss moduli of CNF–IL–water suspensions, compared to their CNF–water counterparts. The nanopaper prepared by removing the IL–water shows a combination of large elongation (up to 35%), high strength (260 MPa), and toughness as high as 51 MJ/m3, because of efficient interfibrillar slippage and energy dissipation in the highly disordered isotropic structure. This work provides a nanostructure-engineered strategy of making ductile and tough cellulose nanopaper.
Original languageEnglish
Pages (from-to)11150-11159
Number of pages10
JournalACS Nano
Volume14
Issue number9
Early online date17 Aug 2020
DOIs
Publication statusPublished - 22 Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • nanocellulose
  • ioniq liquid
  • hemicellulose
  • viscoelastic properties
  • ductile
  • mechanical properties

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