Multifunctional polypropylene composites produced by incorporation of exfoliated graphite nanoplatelets

Kalaitzidou, Kyriaki; Fukushima, Hiroyuki; Drzal, Lawrence T.

doi:10.1016/j.carbon.2007.03.029

Cited by 506 publications

(367 citation statements)

References 17 publications

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“…Graphite is usually recognized as the best conductive filler because of its good thermal conductivity, low cost and fair dispersability in polymer matrix (Causin et al, 2006) and (Tu & Ye, 2009). Single graphene sheets constituting graphite show intrinsically high thermal conductivity of about 800 W/m K (Liu et al, 2008) or higher (theoretically estimated to be as high as 5300 W/m K ( Veca et al, 2009) and (Stankovich et al, 2006)), this determining the high thermal conductivity of graphite, usually reported in the range from 100 to 400 W/m K. Expanded graphite (EG), an exfoliated form of graphite with layers of 20-100 nm thickness, has also been used in polymer composites (Ganguli et al, 2008), for which the thermal conductivity depends on the exfoliation degree (Park et al, 2008), its dispersion in matrix and the aspect ratio of the EG (Kalaitzidou et al, 2007).…”

Section: Carbon-based Fillersmentioning

confidence: 99%

Thermal Conductivity of Nanoparticles Filled Polymers

Ebadi‐Dehaghani¹,

Nazempour²

2012

Smart Nanoparticles Technology

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Section: Carbon-based Fillersmentioning

confidence: 99%

Thermal Conductivity of Nanoparticles Filled Polymers

Ebadi‐Dehaghani¹,

Nazempour²

2012

Smart Nanoparticles Technology

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“…and PTC membranes The incorporation of graphene-based materials such as graphene nanoplatelets (GNPs), GNSs, and GO can significantly reduce gas permeation through a polymer composite [9,[47][48][49][50]. A percolating network of graphene nanoplatelets or nanosheets can increase tortuosity, which inhibits molecular diffusion through the matrix, thus resulting in significantly reduced permeability [9].…”

Section: Gas Barrier and Optical Clarity Of Pmmamentioning

confidence: 99%

The effect of varying carboxylic-group content in reduced graphene oxides on the anticorrosive properties of PMMA/reduced graphene oxide composites

Chang¹,

Ji²,

Li³

et al. 2014

Express Polym. Lett.

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Abstract.We present comparative studies on the effect of varying the carboxylic-group content of thermally reduced graphene oxides (TRGs) on the anticorrosive properties of as-prepared poly(methyl methacrylate) (PMMA)/TRG composite (PTC) coatings. TRGs were formed from graphene oxide (GO) by thermal exfoliation. The as-prepared TRGs were then characterized using Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Subsequently, the PTC materials were prepared via a UV-curing process and then characterized using FTIR spectroscopy and transmission electron microscopy (TEM). PTC coatings containing TRGs with a higher carboxylic-group content exhibited better corrosion protection of a cold-rolled steel electrode that those with a lower carboxylic-group content. This is because the well-dispersed TRG with a higher carboxylic-group content embedded in the PMMA matrix effectively enhances the oxygen barrier properties of the PTC. This conclusion was supported by gas permeability analysis.

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“…The variable n shown here is an adaptation for the case of platelet shaped fillers and is a function of the filler's aspect ratio, a. assumptions of the Halpin-Tsai equation include perfect exfoliation to attain the aspect ratio input into Eq. 5, as well as perfect contact between filler and matrix (Kalaitzidou et al 2007b). For the case of xGnP 5 , variables E f and a were taken as 1 TPa and 500, respectively.…”

Section: Flexural Propertiesmentioning

confidence: 99%

Exfoliated graphite nanoplatelet-filled impact modified polypropylene nanocomposites: influence of particle diameter, filler loading, and coupling agent on the mechanical properties

et al. 2013

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Exfoliated graphite nanoplatelets (xGnP)-filled impact-modified polypropylene (IMPP) composites were prepared at 2, 4, 6, and 8 wt % xGnP with and without the addition of a coupling agent and manufactured using melt mixing followed by injection molding. The coupling agent used in this study was polypropylene-graft-maleic anhydride (PP-g-MA). The nanoparticles used were xGnP with three different sizes: xGnP 5 has an average thickness of 10 nm, and an average platelet diameter of 5 lm, whereas xGnP 15 and xGnP 25 have the same thickness but average diameters are 15 and 25 lm, respectively. Test results show that nanocomposites with smaller xGnP diameter exhibited better flexural and tensile properties for both neat and compatibilized composites. For composites containing a coupling agent, tensile and flexural modulus and strength increased with the addition of xGnP. In the case of neat composites, both tensile and flexural modulus and strength decreased at higher filler loading levels. Increasing xGnP loading resulted in reduction of elongation at break for both neat and composites containing coupling agent. Explanation of this brittle behavior in a nanoplatelet-filled IMPP is presented using scanning electron microscopy and transmission electron microscopy.

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Multifunctional polypropylene composites produced by incorporation of exfoliated graphite nanoplatelets

Cited by 506 publications

References 17 publications

Thermal Conductivity of Nanoparticles Filled Polymers

Thermal Conductivity of Nanoparticles Filled Polymers

The effect of varying carboxylic-group content in reduced graphene oxides on the anticorrosive properties of PMMA/reduced graphene oxide composites

Exfoliated graphite nanoplatelet-filled impact modified polypropylene nanocomposites: influence of particle diameter, filler loading, and coupling agent on the mechanical properties

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