Study on the morphology development and dispersion mechanism of polypropylene/graphene nanoplatelets composites for different shear field

He, Suihua; Zhang, Jingjing; Xiao, Xiaoting; Lai, Yongjian; Chen, Anfu; Zhang, Zhengrong

doi:10.1016/j.compscitech.2017.10.024

Cited by 22 publications

(12 citation statements)

References 41 publications

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“…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%

“…During extrusion, rupture and erosion provoke that large GnPs agglomerates tend to be exfoliated into smaller platelets. He et al [58] determined that the residence time is a key parameter for a better dispersion of GnP. Only erosion mechanism thin layers can be exfoliated and by increasing the residence time in a twin-screw configuration, the homogeneity of the particle size distribution and the dispersibility of the nanophase are enhanced.…”

Section: Polypropylene Matrix 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: Thermoplastic Nanocompositesmentioning

confidence: 99%

Section: Polypropylene Matrix 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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“…where A 11 and A 22 are the Hamaker constants of the particles and media, respectively, and A 121 is the effective Hamaker constant. The hydrodynamic shear stress on the spherical nanoparticle agglomerates is given by the following equation [24]:…”

Section: Effect Of Wetting Behavior On Dispersion Of Nanoparticlesmentioning

confidence: 99%

“…Two systems from the literature have also been added to the plot. He et al [24] worked on the dispersion of graphene nanoplatelets in a polypropylene matrix and used different screw configurations to develop variable levels of shear in the melt. The graphene-polypropylene system is plotted in Figure 11 by the ( ) marker.…”

Section: Effect Of Wetting Behavior On Dispersion Of Nanoparticlesmentioning

confidence: 99%

Investigating the effect of surface modification on the dispersion process of polymer nanocomposites

Prasad

Wang

et al. 2020

Nanocomposites

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Achieving controlled nanoparticle dispersion through melt processing has been challenging as processing-structure rules for polymer nanocomposites are still not well-defined. This work focuses on developing a quantitative understanding of the filler-matrix compatibility and melt mixing parameters on the dispersion of nanoparticles. Filler-matrix compatibility was varied by surface modification of silica nanoparticles. A twin screw extruder was used to prepare the nanocomposites and TEM imaging and image analysis were used to quantitively characterize the microstructure. It was found that matrix-filler compatibility strongly affected the method of agglomerate breakdown and dispersion. Under similar conditions, compatible systems tended to disperse via rupture of agglomerates while incompatible systems were found to disperse via erosion. A map was created to predict the dispersion mechanism as a function of processing conditions and system compatibility and systems from this study and literature were found to be in good agreement with the map.

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“…Similar result was also reported by He et al (2017a) in extruded and compression molded PP/GNP nanocomposites. He et al (2017b) also reported that the residence time during extrusion plays an important role in dispersing GNP and better dispersion of GNP tends to increase the electrical and thermal conductivities of the resulting PP/GNP nanocomposites and significantly reduce the electrical percolation threshold.…”

Section: Introductionmentioning

confidence: 97%

Characterizing Biaxially Stretched Polypropylene / Graphene Nanoplatelet Composites

et al. 2021

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In this work, polypropylene (PP) nanocomposites containing different weight concentration of graphene nanoplatelets (GNP) were prepared by melt-mixing using an industrial-scale, co-rotating, intermeshing, twin-screw extruder. The materials were then compression moulded into sheets, and biaxially stretched at different stretching ratios (SRs) below the PP melting temperature. The effects of GNP content and biaxial stretching on the bulk properties of unfilled PP and PP/GNP nanocomposites have been investigated in details. Results show that the addition of GNP (>5wt%) can lead to electrically conductive composites due to the formation of percolation network. The GNP have led to increased polymer crystallinity and enhanced materials stiffness and strength. Biaxial stretching process further enhances the materials mechanical properties but has slightly decreased the composites electrical conductivity. The PP/GNP nanocomposites were also processed into 3D demonstrator parts using vacuum forming, and the properties of which were comparable with biaxially stretched composites.

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Study on the morphology development and dispersion mechanism of polypropylene/graphene nanoplatelets composites for different shear field

Cited by 22 publications

References 41 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

Investigating the effect of surface modification on the dispersion process of polymer nanocomposites

Characterizing Biaxially Stretched Polypropylene / Graphene Nanoplatelet Composites

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