The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites

Cardoso, Paulo; Silva, Jaime; Klosterman, Donald A.; Covas, J. A.; Hattum, F. W. J. van; Simões, Ricardo; Lanceros‐Méndez, S.

doi:10.1186/1556-276x-6-370

Cited by 22 publications

(13 citation statements)

References 13 publications

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“…Many long MWCNTs cross the observed area even at a relatively low magnification. The observation is in agreement with the reported literatures . In the SM sample, MWCNT length is in a wide range because small shear force and shorter mixing time is applied.…”

Section: Results and Dicussionsupporting

confidence: 91%

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Zhao

Wang

2018

Polymer Composites

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Nanocomposites of polymethyl methacrylate/multi‐walled carbon nanotubes (MWCNTs) were prepared via four different methods, namely, melt blending cum injection molding (MI), melt blending cum compression molding (MC), solution blending cum compression molding (SC), and solution blending cum melt compounding (SM). The effects of preparation methods on the microstructure, mechanical and electrical properties, and electromagnetic interference (EMI) shielding performance were investigated. The solution‐based methods can disperse MWCNTs more uniformly without any significant agglomerates than the melt‐based methods. The injection molding method led to significant alignment of MWCNTs, while the compression molding method allowed MWCNTs randomly distributed. Because of the uniform dispersion of MWCNTs, the SM nanocomposite exhibited the lowest percolation threshold (0.25 vol%), and the highest modulus and electrical conductivity among all the samples. Under a MWCNT concentration of 1.72 vol%, the SM nanocomposite showed a shielding effectiveness up to 68 dB. The MI and MC nanocomposite showed poor mechanical and electrical properties due to severe agglomerates and breakages of MWCNTs. The EMI shielding mechanism of the nanocomposites prepared by different methods was discussed by coupling the distribution, dispersion and microstructure of MWCNTs, and shielding theory. The findings are important for guiding the design and fabrication of high‐efficient conductive polymer nanocomposites. POLYM. COMPOS., 40:E1786–E1800, 2019. © 2018 Society of Plastics Engineers

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Section: Results and Dicussionsupporting

confidence: 91%

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Zhao

Wang

2018

Polymer Composites

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“…In contrast to the EFM, the RMX is positioned towards the laboratory scale, giving it the ability to study new or expensive systems without much material input. Finally, extensional dispersion has been achieved using a modified capillary rheometer setup [21][22][23] that contained a series of stacked rings with equal outer diameters but alternating larger and smaller inner diameters. Material is forced down through the rings by the piston of the capillary rheometer, resulting in elongationally dominated flow allowing for characteristic flow studies.…”

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confidence: 99%

A New Extensional Mixing Element for Improved Dispersive Mixing in Twin‐Screw Extrusion, Part 1: Design and Computational Validation

2015

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Twin‐screw extruders (TSE) are typically the equipment of choice in polymer blending and compounding operations due to the relatively high stresses and controllable residence times they impart on the melts. However, the mixing action is shear dominated and shear flows are energetically inefficient for dispersive mixing by comparison with extensional flows. We present a new extensional mixing element (EME), developed as a static dispersive mixing element for TSEs with dispersive mixing provided by extension‐dominated flow through stationary hyperbolically contracting channels. In Part 1 of the work, we present the design and show, experimentally and computationally, that the EME effectively imparts extension‐dominated flow through its channels. We also show that the flow is fully developed throughout most of the EME sections, with only small inlet transients being observed, and that it is possible to predict the real pressure drop in the system. Experimental validation of the EME for immiscible blends of varying viscosity ratios will be discussed in Part 2.

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“…In SC samples an inhomogeneous network is formed due to the local agglomeration process that effectively increases the free space between dispersed CNTs. This in turn leads to a significant decrease in percolation threshold − (Figure , middle), as the inhomogeneous network appears to have a higher effective CNT volume fraction as compared with a random network (Figure , right) that is observed in EXT samples.…”

Section: Discussion On the Differences In Conductive Networkmentioning

confidence: 91%

Quantitative Analysis of Connectivity and Conductivity in Mesoscale Multiwalled Carbon Nanotube Networks in Polymer Composites

Gnanasekaran

Friedrich

2016

J. Phys. Chem. C

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The influence of the dispersion method on the electrical properties of vapor-grown carbon nanofiber/epoxy composites

Cited by 22 publications

References 13 publications

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

A New Extensional Mixing Element for Improved Dispersive Mixing in Twin‐Screw Extrusion, Part 1: Design and Computational Validation

Quantitative Analysis of Connectivity and Conductivity in Mesoscale Multiwalled Carbon Nanotube Networks in Polymer Composites

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