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Impressive Fatigue Life and Fracture Toughness Improvements in Graphene Oxide/Epoxy Composites
Abstract
Epoxy systems have proven popular having important applications in aerospace and wind energy, but fracture and fatigue resistance of this polymer remain less than desired. Graphene oxide, a form of atomically thin carbon, possessing impressive multifunctional properties and an ideal interface for interacting with polymer matrices, has emerged as a viable reinforcement candidate. In this work, we report enhancements of 28–111% in mode I fracture toughness and up to 1580% in uniaxial tensile fatigue life through the addition of small amounts (≤1 wt %) of graphene oxide to an epoxy system. Graphene oxide was uniquely synthesized by unraveling and splaying open helical-ribbon carbon nanofibers. The resulting oxygenated basal planes and edges of the graphene oxide sheets were observed to promote onset of the cross-linking reaction and led to an increase in total heat of reaction effecting slightly higher glass transition temperatures of the cured composites. Measured improvements were also detected in quasi-static tensile and flexural stiffness and strength. The addition of only 0.1 wt % graphene oxide yielded a ∼12% increase in tensile modulus. At 1 wt %, flexural stiffness and strength were 12 and 23% greater than the unmodified epoxy. Sheets were observed to be well-dispersed and at various orientations within the matrix, enabling their large, 2D, and zero bulk dimensions to pin incipient matrix cracks, a toughening mechanism not typically detected in nanocomposites.
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Cites
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Reinforcing Effects of Graphene Oxide on Portland Cement Paste
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Epoxy Toughening with Low Graphene Loading
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Control of the functionality of graphene oxide for its application in epoxy nanocomposites
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Graphene Aerogel/Epoxy Composites with Exceptional Anisotropic Structure and Properties
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Graphene-Based Nanocomposites: Synthesis, Mechanical Properties, and Characterizations
Ibrahim, A., Klopocinska, A., Horvat, K., & Abdel Hamid, Z. (2021) · Polymers · doi:10.3390/polym13172869 · Cited by 265
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Metadata
- Authors
- Bortz, D. R., Heras, E. G., & Martin-Gullon, I.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-12-02
- Volume
- 45
- Issue
- 1
- Pages
- 238-245
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2322641051
- Cited by
- 514
- References
- 2
- FWCI
- 31.87
- Type
- journal article
- Language
- en
- Open access
- closed
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