Multifunctional epoxy composites modified with a graphene nanoplatelet/carbon nanotube hybrid

Kopsidas, Sotirios; Olowojoba, Ganiu B.

doi:10.1002/app.50890

Cited by 17 publications

(16 citation statements)

References 44 publications

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“…It is interesting to evaluate this hybrid with a thickness of some nanometers. Some researchers have reported nanocomposites with improved properties using graphene nanoplatelets not only of a few layers, but several nanometers of thickness 43,44 . The thermo‐mechanical response of reinforced specimens was analyzed through DMA due to its sensitivity to relaxation processes and transition of the epoxy matrix.…”

Section: Resultsmentioning

confidence: 99%

“…Some researchers have reported nanocomposites with improved properties using graphene nanoplatelets not only of a few layers, but several nanometers of thickness. 43,44 The thermo-mechanical response of reinforced specimens was analyzed through DMA due to its sensitivity to relaxation processes and transition of the epoxy matrix. The storage modulus and loss factor (tan δ) are showed in Figure 8 for all specimens.…”

Section: Epoxy Nanocomposites Reinforced With G-cnt Hybridmentioning

confidence: 99%

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Hybrid based on graphene nanoplatelets and carbon nanotubes obtained in a single‐step approach and its reinforcement effect in an epoxy matrix

Ramos‐Galicia

Pérez‐Ramírez

Velasco‐Santos

et al. 2022

J of Applied Polymer Sci

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A hybrid based on graphene nanoplatelets and carbon nanotubes (G‐CNT) is obtained through direct exfoliation of graphite in a liquid medium, and tested as reinforcement material in epoxy resin. CNT act as exfoliation material in contact with graphite under ultrasound irradiation, and the thickness of graphite decreases to produce graphene nanoplatelets in an easy one‐step method. The morphology of the hybrid, is observed through transmission electron microscopy micrographs exhibiting delamination of graphite. XRD, UV–vis, and atomic force microscopy (AFM) results provide evidence of the exfoliation of graphite by interaction with CNT. Ultrasonic process does not generate additional oxygenated groups on carbon structures, as it is supported by XPS spectra; and the disorder in the carbon structures detected in Raman spectra is attributed to defects originated by some fragmentations. Epoxy nanocomposites incorporating 0.3 wt% of G‐CNT display the highest enhancement in storage modulus (~2706 MPa), glass transition region increases meaning higher thermal stability, and glass transition temperature increases until 119°C. Impact resistance also enhances with 0.3 wt% of G‐CNT, obtaining ~95% of increment. The hybrid obtained by exfoliating graphite with CNT in one‐step improves the performance of nanocomposites, and it offer an easy and viable alternative to obtain hybrid systems.

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Section: Resultsmentioning

confidence: 99%

Section: Epoxy Nanocomposites Reinforced With G-cnt Hybridmentioning

confidence: 99%

Hybrid based on graphene nanoplatelets and carbon nanotubes obtained in a single‐step approach and its reinforcement effect in an epoxy matrix

Ramos‐Galicia

Pérez‐Ramírez

Velasco‐Santos

et al. 2022

J of Applied Polymer Sci

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“…Electrically conductive epoxy polymers were developed by incorporating GNPs and CNTs into the epoxy resin 25 . Figure 3 shows the electrical conductivity versus frequency for the bulk epoxy polymers modified with a fixed nanocarbon filler loading of 0.5 wt%.…”

Section: Resultsmentioning

confidence: 99%

Lightning strike damage resistance of carbon‐fiber composites with nanocarbon‐modified epoxy matrices

Kopsidas

Olowojoba

Stone

et al. 2022

J of Applied Polymer Sci

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Carbon-fiber reinforced polymer (CFRP) composites are replacing metal alloys in aerospace structures, but they can be vulnerable to lightning strike damage if not adequately protected due to the poor electrical conductivity of the polymeric matrix. In the present work, to improve the conductivity of the CFRP, two electrically conductive epoxy formulations were developed via the addition of 0.5 wt% of graphene nanoplatelets (GNPs) and a hybrid of 0.5 wt% of GNPs/ carbon nanotubes (CNTs) at an 8:2 mass ratio. Unidirectional CFRP laminates were manufactured using resin-infusion under flexible tooling (RIFT) and wet lay-up (WL) processes, and subjected to simulated lightning strike tests. The electrical performance of the RIFT plates was far superior to that of the WL plates, independent of matrix modification, due to their greater carbon-fiber volume fraction. The GNP-modified panel made using RIFT demonstrated an electrical conductivity value of 8 S/cm. After the lightning strike test, the CFRP panel remains largely unaffected as no perforation occurs. Damage is limited to matrix degradation within the top ply at the point of impact and localized charring of the surface. The GNP-modified panel showed a comparable level of resistance against lightning damage with the existing copper mesh technology, offering at the same time a 20% reduction in the structural weight. This indicates a feasible route to improve the lightning strike damage resistance of carbon-fiber composites without the addition of extra weight, hence reducing fuel consumption but not safety.conducting polymers, graphene and fullerenes, nanotubes, thermosets | INTRODUCTIONFiber composites comprising continuous fibers embedded in a polymer matrix find extensive use in applications because of their low weight, high mechanical strength, and high stiffness compared to the unmodified polymer. 1 High performance applications commonly use carbon fibers in a thermoset epoxy matrix. As such, carbon-fiber reinforced polymer (CFRP) composites are being increasingly employed in the aerospace industry to replace

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“…Kopsidas and Olowojoba [ 155 ] modified an EP using a hybrid nanofiller, consisting of GNPs and CNTs with a mass ratio of 9:1 using a three‐roll milling technique. The incorporation of 1 wt.% hybrid nanofiller led to an enhancement of approximately 180% in the fracture energy of EP.…”

Section: Toughening Of Epoxy Resins Using Hybrid Of Carbonaceous Nano...mentioning

confidence: 99%

A review of recent progress in improving the fracture toughness of epoxy‐based composites using carbonaceous nanofillers

et al. 2022

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Epoxy resins (EPs) exhibit various extraordinary properties, including significant mechanical and thermal properties, low shrinkage, and high chemical resistance, opening a wide window of different applications such as adhesives, paints, coatings, etc. By contrast, EPs also have the undesirable behavior of being brittle and cannot sufficiently resist against the initiation and growth of cracks. Efforts are being made to enhance the toughening of EPs without sacrificing their other desirable properties. With the advent of nanotechnology, improving the toughening of EPs has gained momentum by incorporating different modified and unmodified nanofillers into these polymers. Since the discovery of carbonaceous nanofillers, especially carbon nanotubes (CNTs) and graphene (Gr), significant progress has been made in the development of EP‐based composites incorporating these nanofillers and their hybrids. The current review presents research progress during the last six years on the toughening of EPs using CNTs, Gr, and CNT‐Gr hybrids. Special attention is given to the chemical functionalization of these nanofillers, which has been demonstrated over and over again to significantly affect nanofiller dispersion in the EP matrix and subsequently its fracture properties. Details on the various toughening mechanisms of EP‐based composites are further provided.

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Multifunctional epoxy composites modified with a graphene nanoplatelet/carbon nanotube hybrid

Cited by 17 publications

References 44 publications

Hybrid based on graphene nanoplatelets and carbon nanotubes obtained in a single‐step approach and its reinforcement effect in an epoxy matrix

Hybrid based on graphene nanoplatelets and carbon nanotubes obtained in a single‐step approach and its reinforcement effect in an epoxy matrix

Lightning strike damage resistance of carbon‐fiber composites with nanocarbon‐modified epoxy matrices

A review of recent progress in improving the fracture toughness of epoxy‐based composites using carbonaceous nanofillers

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