Investigation of the conductive network formation of polypropylene/graphene nanoplatelets composites for different platelet sizes

He, Suihua; Zhang, Jingjing; Xiao, Xiaoting; Hong, Xinmi; Lai, Yongjian

doi:10.1007/s10853-017-1413-y

Cited by 33 publications

(18 citation statements)

References 52 publications

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“…These findings agree with computational studies [63]. On the other hand, large size nanofillers reduce the percolation threshold and increase electrical conductivity [52]. The role of large GnP as nucleating agents for PP crystallization has been also observed by Jun et al [53] in extruded and injected nanocomposites.…”

Section: Polypropylene Matrix Nanocompositessupporting

confidence: 87%

“…These new nanocomposites have been obtained by extrusion, in most cases twin-screw extrusion, which can be followed by injection molding. Table 2 shows that polypropylene (PP) matrix has been most commonly used [47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62] due to its availability and ease of processing. The effect of the concentration of nanofillers is a key parameter in the processing of nanocomposites.…”

Section: Thermoplastic Nanocompositesmentioning

confidence: 99%

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Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments

et al. 2020

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This review is focused on the recent developments of nanocomposite materials that combine a thermoplastic matrix with different forms of graphene or graphene oxide nanofillers. In all cases, the manufacturing method of the composite materials has been melt-processing, in particular, twin-screw extrusion, which can then be followed by injection molding. The advantages of this processing route with respect to other alternative methods will be highlighted. The results point to an increasing interest in biodegradable matrices such as polylactic acid (PLA) and graphene oxide or reduced graphene oxide, rather than graphene. The reasons for this will also be discussed.

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Section: Polypropylene Matrix Nanocompositessupporting

confidence: 87%

Section: Thermoplastic Nanocompositesmentioning

confidence: 99%

Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments

et al. 2020

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“…The spherical MFG‐Ar exhibited much larger percolation threshold around 40 wt%. According to the literature, GnPs derived from graphite intercalates with a much larger average width of 150 µm exhibited lower percolation thresholds of 8 wt% and had electrical conductivities in the range of 10 −3 –10 −5 S∙cm −1 …”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, GnPs derived from graphite intercalates with a much larger average width of 150 µm exhibited lower percolation thresholds of 8 wt% and had electrical conductivities in the range of 10 −3 -10 −5 S•cm −1 . [170,171] The comparison of MFG-CO 2 -24h/PP with MFG-At-24h/ PP composites (see the spider diagram displayed in Figure 23) demonstrated that the addition of 40 wt% MFG rendered PP electrically conductive while simultaneously increasing the stiffness as reflected by higher Young's modulus accompanied by effective nucleation PP crystallization as verified by higher crystallization temperature T c . The high Young's modulus of 4.5 GPa, corresponding to an increase by +355% with respect to the unfilled PP, is superior to 2.8 GPa (+221%) of the corresponding PP composite containing the identical amount of spherical MFG-Ar-24h/PP.…”

Section: Carbon/hydrocarbon Nanocompositesmentioning

confidence: 99%

Mechanochemical Routes to Functionalized Graphene Nanofillers Tuned for Lightweight Carbon/Hydrocarbon Composites

Burk¹,

Gliem²,

Mülhaupt³

2018

Macro Materials & Eng

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Graphite exfoliation by shear‐induced dry and wet processes and especially mechanochemistry represent attractive routes to carbon nanofillers. Dry ball‐milling of graphite in a planetary mill under gas pressure is a scalable and environmentally benign one‐step process, which requires neither hazardous solvents nor tedious separate functionalization and purification steps. Gas type, pressure, and milling duration govern average particle size, shape, and functionalization. Ball‐milling under Ar yields hydroxylated spherical carbon particle agglomerates, whereas ball‐milling under CO2 affords functionalized nanoplatelets without encountering agglomeration problems and highly exothermic post‐milling reactions with air. The carboxylation of graphene nanoplatelets enhances their dispersibility in various media including polypropylene (PP) even in the absence of compatibilizers. Large amounts of carboxylated nanoplatelets are dispersed in PP without massive viscosity build‐up. Functionalized carbon nanoplatelet fillers enable tailoring of recyclable lightweight carbon/hydrocarbon composites exhibiting an improved balance of stiffness, strength, toughness, electrical, and thermal conductivity.

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“…Afterwards, they were cooled to 20 °C at a rate of 20 °C min −1 and were reheated to 200 °C with heating rate of 20 °C min −1 . The degree of crystallinity ( X c ) was determined out as follows:

X_{normalc} = \frac{Δ H_{normalPP}}{Δ H_{normalPP}^{*} ω} \times 100 %

<NI>where

Δ H_{normalPP}^{*}

(209 J g −1 ) is the melting enthalpy of 100% crystalline PP, Δ H PP is the melting enthalpies of the samples evaluated from the DSC heating thermograms and ω is the weight fraction of PP in the nanocomposites.…”

Section: Methodsmentioning

confidence: 99%

Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

Xue

Chen

Yin

et al. 2018

Polymer International

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Reduced graphene oxide (rGO) with various surface structures was prepared by reducing graphene oxide (GO) with hydrazine hydrate (N 2 H 4 ), sodium borohydride (NaBH 4 ) and L-ascorbic acid, respectively. The resulting rGO were used to fabricate rGO/polypropylene (PP) nanocomposites by a melt-blending method. The surface structure of rGO as well as multifunctional properties of rGO/PP nanocomposites were thoroughly investigated. It was shown that rGO with highest C/O ratio could be obtained by reducing GO with N 2 H 4 . The crystallization behaviors, tensile strength, thermal conductivity and thermal stability of rGO/PP nanocomposites were significantly improved with the increase of C/O ratio of rGO. For example, with only 1 phr (parts per hundred PP) rGO reduced by N 2 H 4 , the degree of crystallinity, tensile strength, maximum heat decomposition temperature and thermal conductivity of PP nanocomposite were increased by 6.2%, 20.5%, 48.0 ∘ C and 54.5%, respectively, compared with those of pure PP. Moreover, the thermal degradation kinetics indicated that the decomposition activation energy of rGO/PP nanocomposites could be enhanced by adding rGO with higher C/O ratio.

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Investigation of the conductive network formation of polypropylene/graphene nanoplatelets composites for different platelet sizes

Cited by 33 publications

References 52 publications

Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments

Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments

Mechanochemical Routes to Functionalized Graphene Nanofillers Tuned for Lightweight Carbon/Hydrocarbon Composites

Effect of oxygen functional groups of reduced graphene oxide on the mechanical and thermal properties of polypropylene nanocomposites

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