Carbon nanotube enhanced carbon Fibre-Poly(ether ether ketone) interfaces in model hierarchical composites
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Poly (ether ether ketone) (PEEK) has a high continuous service temperature, excellent mechanical properties, and good solvent and abrasion resistance, which can be further improved through the addition of carbon nanotubes (CNTs). CNT-PEEK nanocomposites are promising matrices for continuous carbon fibre composites; powder processing can mitigate the high melt viscosities in these systems. In this study, model single fibre (hierarchical) composites were produced by embedding sized and desized carbon fibres in nanocomposite CNT-PEEK powders followed by single fibre pull-out tests to assess interfacial characteristics. Carbon fibre-PEEK interfacial shear strength is typically 40–45 MPa. Increasing CNT loadings increased fibre-matrix interfacial shear strength linearly up to ∼70 MPa at 5.0 wt%, which was attributed to the CNT-based mechanical modification of the PEEK matrix. Apparent interfacial shear strength was inversely correlated with the embedded fibre length irrespective of carbon fibre sizing or CNT loading, indicating brittle fracture of the fibre-matrix interface. Pulled out carbon fibres were still coated with the matrix, which indicated strong adhesion at the interface in all samples, likely related to a transcrystalline region. Adhesion was, however, negatively affected by the presence of epoxy sizings. Frictional shear strength was independent of embedded fibre length and CNT content for all samples.
Date Issued
2022-04-12
Date Acceptance
2022-02-08
Citation
Composites Science And Technology, 2022, 221
ISSN
0266-3538
Publisher
Elsevier
Journal / Book Title
Composites Science And Technology
Volume
221
Copyright Statement
© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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Subjects
ADHESION
BEHAVIOR
Carbon fibres
Carbon nanotubes
CRYSTALLINITY
Debonding
FIBER
Interfacial strength
Materials Science
Materials Science, Composites
MATRIX-MORPHOLOGY
MECHANICAL-PROPERTIES
PEEK
Poly(ether ether ketone)
POLYMER
Science & Technology
SHEAR-STRENGTH
Technology
Publication Status
Published
Article Number
109327
Date Publish Online
2022-02-10