Interfacial Stress Transfer in a Graphene Monolayer Nanocomposite

Gong, Lei; Kinloch, Ian A.; Young, Robert J.; Riaz, Ibtsam; Jalil, R.; Новоселов, К. С.

doi:10.1002/adma.200904264

Cited by 575 publications

(612 citation statements)

References 31 publications

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“…However, no apparent shifts are detected when UTG is present. On the contrary, the characteristic G-band, clearly visible in all the composite spectra, is up-shifted up to 12 cm -1 with increasing UTG content, suggesting interactions between TPU and UTG due to interfacial stress transfer [30].…”

Section: More Sensitive Information On What Concerns Possible Interacmentioning

confidence: 90%

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

Menes

Cano

Benedito

et al. 2012

Composites Science and Technology

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Composites of thermoplastic polyurethane (TPU) and ultra-thin graphite (UTG) with concentrations ranging from 0.5 to 3 wt% were prepared using a solution compounding strategy. Substantial reinforcing effects with increased loadings are achieved. Compared to neat TPU, values for storage modulus and shear viscosity are enhanced by 300 % and 150 %, respectively, for UTG concentrations of 3 wt%. Additionally, an enhancement of thermal properties is accomplished. The crystallization temperature and thermal stability increased by 30 ºC and 10 ºC, respectively, compared to neat TPU. Controlling the oxidation degree, thus offers further possibilities to obtain composites with tailored properties. The presented approach is straightforward, leads to homogeneous TPU-UTG composites with improved materials properties and is especially suitable for commercial UTG materials and further up-scaled production.

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Section: More Sensitive Information On What Concerns Possible Interacmentioning

confidence: 90%

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

Menes

Cano

Benedito

et al. 2012

Composites Science and Technology

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“…[16] Young et al have shown (for graphene-PMMA composites at least), that this poor performance is due to very poor stress-transfer at the interface. [17] This is different to polymer-nanotube composites where good stress transfer has been observed by many researchers. [18,19] In principle, stress transfer can be improved by functionalisation.…”

Section: Introductionmentioning

confidence: 99%

Development of stiff, strong, yet tough composites by the addition of solvent exfoliated graphene to polyurethane

Khan

May

O’Neill

et al. 2010

Carbon

280

200

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Please cite this article as: Khan, U., May, P., O'Neill, A., Coleman, J.N., Development of stiff, strong, yet tough composites by the addition of solvent exfoliated graphene to polyurethane, Carbon (2010), doi: 10.1016/j.carbon. 2010.07.008 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Development of stiff, strong, yet tough composites by the addition of solvent We have prepared graphene dispersions, stabilised by polyurethane in tetrahydrofuran and dimethylformamide. These dispersions can be drop-cast to produce free-standing composite films. The graphene mass fraction is determined by the concentration of dispersed graphene and can be controllably varied from 0% to 90%. Raman spectroscopy and Helium ion microscopy show the graphene to well-dispersed and well-exfoliated in the composites, even at mass fractions of 55%. On addition of graphene, the Young's modulus and stress at 3% strain increase by ×100, saturating at 1 GPa and 25 MPa respectively for mass fractions above 50wt%. While the ultimate tensile strength does not vary significantly with graphene content, the strain at break and toughness degrade heavily on graphene addition. Both these properties fall by ×1000 as the graphene content is increased to 90wt%. However, the rate of increase of Young's modulus and stress at 3% strain with mass fraction is greater than the rate of decrease of ductility and toughness.This makes it possible to prepare composites with high modulus, stress at low strain and ultimate tensile strength as well as relatively high toughness and ductility. This could lead to new materials that are stiff, strong and tough. With this in mind, we propose a different approach. Rather than reinforcing thermoplastics, we suggest that graphene might make an impact reinforcing elastomers.Reinforcement mechanisms in elastomeric composites are more complex than in thermoplastic based composites, a fact that may circumvent the poor stress transfer described above. Hard thermoplastics are characterised by relatively high stiffness and strength but low ductility and toughness (work done to fracture). Conversely, elastomers are characterised by low stiffness and low stress at low strain but high ductility and toughness. We propose that addition of graphene to elastomers could result in a material with positive elements of both hard thermoplastics and elastomers: high stiffness and strength yet relatively large ductility and toughness. Such materials would be useful in a range of applications.For such composites to have the properties outlined, a delicate balance must be maintained. While addition of nano-fillers such as nanotubes, nano...

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“…maximum shear stress of 2.3 MPa at the edge of the sheet; graphene-matrix interfacial shear stress is on the order of 0.25-0.8 MPa and with a maximum value of 1 MPa [42]; fracture stress of a graphene sheet is larger than 100 GPa and the failure strain loading is on the order of 20% [28]. …”

Section: Materials Propertiesmentioning

confidence: 99%

“…Novoselov, Young and their colleagues at the University Manchester [42][43][44] studied the change in the strain distribution on graphene, and observed that the strain across the flake is uniform at the applied strain up to 0.6%. After that cracks form in polymer coating layers, with the graphene remaining intact.…”

Section: Properties Of Graphene/polymer Interface: Inverse Modelingmentioning

confidence: 99%

Graphene reinforced nanocomposites: 3D simulation of damage and fracture

Dai

Mishnaevsky

2014

Computational Materials Science

123

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Interfacial Stress Transfer in a Graphene Monolayer Nanocomposite

Cited by 575 publications

References 31 publications

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

The effect of ultra-thin graphite on the morphology and physical properties of thermoplastic polyurethane elastomer composites

Development of stiff, strong, yet tough composites by the addition of solvent exfoliated graphene to polyurethane

Graphene reinforced nanocomposites: 3D simulation of damage and fracture

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