Cellulose nanocrystal-polyetherimide hybrid nanofibrous interleaves for enhanced interlaminar fracture toughness of carbon fibre/epoxy composites

Jing Wang, Thomas Pozegic, Zhen Xu, Rinat Nigmatullin, Robert Harniman, Stephen J. Eichhorn*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

3 Citations (Scopus)

Abstract

The effect of electrospun cellulose nanocrystals (CNCs)-polyetherimide (PEI) hybrid nanofibrous mats on Mode I and Mode II interlaminar fracture toughness of unidirectional carbon/epoxy composite laminates is demonstrated. It is shown that the CNCs reinforced PEI nanofibrillar interleaves result in a ~28% increase in Mode I initial fracture toughness values compared to neat PEI nanofibrous interleaves. Specifically, the interrelated micro- and nano-scale toughening mechanisms including carbon fibre bridging, fibre necking, fibre rupture with CNCs aggregates, and nanofibre rupture contributed to the fracture toughness improvements under Mode-I loading. Nano-scale mechanisms of shear hackles, and crack pinning by CNCs aggregates increased the Mode II fracture toughness up to ~3 kJ/m2 as a result of a 6 wt.% CNCs reinforced PEI nanofibrillar mat interleaves. Interleaving laminated composites with electrospun CNCs-PEI hybrid nanofibrillar mats has been demonstrated as a novel and prospective strategy to strengthen and toughen interlaminar zones of carbon/epoxy composite laminates.
Original languageEnglish
Article number107744
Number of pages8
JournalComposites Science and Technology
Volume182
Early online date15 Jul 2019
DOIs
Publication statusPublished - 29 Sep 2019

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Structured keywords

  • Bristol Composites Institute ACCIS

Keywords

  • Cellulose nanocrystals
  • Electrospinning
  • Fracture toughness
  • Delamination

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