Multifold interface and multilevel crack propagation mechanisms of graphene oxide/polyurethane/epoxy membranes interlaminar-toughened carbon fiber-reinforced polymer composites
- 352 Downloads
Graphene oxide/polyurethane/epoxy (GO/PU/EP) membranes were directly fabricated by functionalization of graphene oxide with epoxy-grafted polyurethane (GO-UE), and the interface correlation and crack propagation mechanisms in GO/PU/EP membranes interlaminar-toughened carbon fiber-reinforced polymer composites were investigated. The functionalized GO-UE with corrugation and scrolling nature of graphene sheets was evenly dispersed in GO/PU/EP membranes below 0.50 wt% loading. Mode I fracture toughness, flexural properties and interlaminar shear strength of GO/PU/EP membranes-toughened composites were enhanced in comparison with untoughened composites and PU/EP membranes-toughened composites, which was ascribed to the multifold interface bonding between the GO-UE layers, epoxy matrix and carbon fiber. Schematic models of multilevel crack propagations were proposed based on different crack extension directions to GO-UE and the morphology evolutions of GO-UE in the interlaminar region and at the carbon fiber interface in toughened composites, which highlighted the toughening mechanisms of crack pinning, crack deflection and separation between GO-UE layers.
This work was financed from the National Natural Science Foundation of China (Grant No. U1362205).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 5.Li Y, Zhang H, Crespo M, Porwal H, Picot O, Santagiuliana G, Huang ZH, Barbieri E, Pugno NM, Peijs T, Bilotti E (2016) In situ exfoliation of graphene in epoxy resins: a facile strategy to efficient and large scale graphene nanocomposites. ACS Appl Mater Interface 8:24112–24122CrossRefGoogle Scholar