Mechanical properties and toughening mechanisms of epoxy/graphene nanocomposites

Eqra, Rahim; Janghorban, K.; Daneshmanesh, Habib

doi:10.1515/polyeng-2014-0134

Cited by 20 publications

(8 citation statements)

References 24 publications

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“…Epoxy resin (M506) based on the bisphenol-A and hardner (HA11) polyamine were supplied by Mokarrar Engineering Materials, Inc. (Tehran, Iran). The graphene nanosheets were fabricated by thermal expansion and reduction method of graphite in our previous work [3]. Figure 2 shows the scanning electron micrograph (SEM) of graphene which was used in this study.…”

Section: Methodsmentioning

confidence: 99%

“…Also, it is proved that the properties of polymeric materials are enhanced by the addition of nanofiller, without compromising their process ability, inherent mechanical properties and light weights [3]. Polymer-based nanocomposite materials have attracted significant interests in the fields of material science and engineering, for the purpose of creating new materials with new or enhanced properties compared with their pristine, individual material [4].…”

Section: Introductionmentioning

confidence: 99%

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Effect of strain rate on the fracture behaviour of epoxy–graphene nanocomposite

Eqra

Moghim

2016

Bull Mater Sci

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In this study, epoxy-based nanocomposite was fabricated by the addition of graphene nanosheet via a solution casting method. To investigate the effect of strain rate on tensile properties of epoxy, tensile tests were done on standard samples at different strain rates (0.05-1 min −1). The role of strain rate and presence of graphene on fracture behaviour of epoxy were also studied by investigation of the fracture surfaces of some samples by scanning electron microscopy (SEM). Finally, Eyring's model was performed to clarify the role of strain rate on activation volume and activation enthalpy of epoxy. The results of tensile tests showed a maximum strength of epoxy-graphene nanocomposite at the graphene wt% of 0.1%. Tensile strength of epoxy obviously improved with increasing strain rate, but tensile strength of epoxy/graphene nanocomposite sample was less sensitive. Fracture micrographs showed that the mirror zone of the fracture surface of epoxy diminished by increasing strain rate or addition of graphene; and final fracture zone also became rougher. Finally, by investigation of the activation enthalpies, it was showed that much higher enthalpy was needed to fracture the nanocomposite sample, as the activation enthalpy changed from 41.54 for neat epoxy to 67.34 kJ mol −1 for EP-0.1% GNS sample.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of strain rate on the fracture behaviour of epoxy–graphene nanocomposite

Eqra

Moghim

2016

Bull Mater Sci

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“…% CNTs and the loading of 1% G.N. improved mechanical properties [23,[45][46][47]. The compressive strength of 15% carbon fiber-filled CBP friction materials enhanced with a corresponding increase in carbon nanotube content, and CBP 6 had a compressive force that was about 51% higher than that of C.R.…”

Section: Compressive Strength and Modulus Of Friction Materialsmentioning

confidence: 97%

Mechanical and the effect of oil absorption on tribological properties of carbon-based brake pad material

2021

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This research focuses on the mechanical and effect of oil absorption on the tribological properties of carbon-based brake pad material (CBP). Carbon-based materials, including those at a nanosize, are combined for developed brake pad material. The mechanical properties related to wear properties such as compression strength, stiffness, hardness, and absorption properties were determined. The effect of oil absorption on the tribological properties of carbon-based materials was investigated. The obtained properties are compared with that of a ceramic-made brake pad (commercial). The experimental results show that the mechanical and absorption properties of the developed brake pad material varied with the combination and quantity of additives used to develop each brake pad material. CBP material offered higher performance than ceramic-made brake pads. The CBP material showed a higher shear strength of about 110%, 51% enhanced compressive strength, 35% greater modulus, comparative statistical hardness, 98% lesser water intake, and 97% oil absorption rate than ceramic made brake pad. The tribological properties of friction material after soaked in oil proved that absorption properties affect tribological properties of brake pads, which can be attributed to the oil content in the material system. The effect of oil uptakes on wear rate and friction of the commercial brake pad was higher than CBP materials, implying that the loading of carbon-based materials is a viable way to reduce absorption rate, which helps in increasing brake pad performance. The improved properties are suggestive of materials combinations that may be used to develop brake pad materials.

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“…Scanning electron microscope (SEM) analysis of the brittle fracture surfaces was then undertaken to assess the GNP distribution and toughing mechanisms, as shown in Figure 1. All images show river lines caused by the brittle fracture of the thermoset resin (Hull, 1999;Olowojoba et al, 2017), with the crack deflection and pull-out contributed by the embedded GNPs (Johnsen et al, 2007;Bindu et al, 2014;Eqra et al, 2015;Domun et al, 2017;Hu et al, 2020), which are beneficial to the composite toughening. No difference was observed whether the GNPs were mixed into the resin or hardener first.…”

Section: Vacuum Mixing Of Gnp/epoxymentioning

confidence: 99%

Fabrication and Mechanical Performance of Graphene Nanoplatelet/Glass Fiber Reinforced Polymer Hybrid Composites

2021

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Glass fiber reinforced polymer (GFRP) composites are promising alternatives for the traditional carbon steel pipes used in the oil and gas industry due to their corrosion and chemical resistance. However, the out-of-plane mechanical properties of GFRPs still need further improvement to achieve this goal. Hence, in this work, two methods combining either vacuum mixing or spray coating with vacuum-assisted resin infusion were studied to fabricate graphene nanoplatelet (GNP)/GFRP hybrid composites. The former method resulted in a severe filtering effect, where the GNPs were not evenly distributed throughout the final composite, whereas the latter process resulted in a uniform GNP distribution on the glass fabrics. The addition of GNPs showed no modest contribution to the tensile performance of the GFRP composites due to the relatively high volume and in-plane alignment of the glass fibers. However, the GNPs did improve the flexural properties of GFRP with an optimal loading of 0.15 wt% GNPs, resulting in flexural strength and modulus increases of 6.8 and 1.6%, respectively. This work indicates how GNPs can be advantageous for out-of-plane mechanical reinforcement in fiber-reinforced composites.

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Mechanical properties and toughening mechanisms of epoxy/graphene nanocomposites

Cited by 20 publications

References 24 publications

Effect of strain rate on the fracture behaviour of epoxy–graphene nanocomposite

Effect of strain rate on the fracture behaviour of epoxy–graphene nanocomposite

Mechanical and the effect of oil absorption on tribological properties of carbon-based brake pad material

Fabrication and Mechanical Performance of Graphene Nanoplatelet/Glass Fiber Reinforced Polymer Hybrid Composites

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