The electrical conductivity and electromagnetic interference shielding of injection molded multi-walled carbon nanotube/polystyrene composites

Mahmoodi, Mehdi; Arjmand, Mohammad; Sundararaj, Uttandaraman; Park, Simon

doi:10.1016/j.carbon.2011.11.004

Cited by 288 publications

(165 citation statements)

References 21 publications

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“…Depending on carbon black properties percolation thresholds in polycarbonate matrix were found to be from 5 to 10 w% [9], and SE values of 10 dB for carbon black/rubber composites were measured at loadings higher than 30 w% [4]. Concerning CSCNT, their high electrical conductivity together with high aspect ratio (ratio of length to diameter is more than 20) and uniform dispersion in the PMMA can lead to formation of conducting network even at very low loadings (less than 1 w%), in the same way as was observed for MWCNT [5,10] and SWCNT [9], and as a result to the higher SE. Comparing to the data for MWCNT / polypropylene composites, reported in [5], the values of SE measured in the present work for CSCNT/PMMA composites are lower, that can be explained by lower electrical conductivity of CSCNT in comparison with MWCNT, but this requires additional studies.…”

Section: Compositesupporting

confidence: 58%

Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

2011

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In the present work, electromagnetic interference shielding properties of polymer composites with dispersed cup-stacked carbon nanotubes, graphite nanoparticles and carbon black were investigated. The polymer composites with carbon nanoparticles content from 1 to 5 w% were successfully prepared by the coagulation method, and composite sheets with thickness from 0.25 to 0.77 mm were formed by the hot press technique. The electromagnetic interference shielding efficiency measured in the frequency range of 8.2~12.4 GHz (X-band) of cup-stacked carbon nanotubes/polymer composite was considerably higher than that of carbon black and graphite nanoparticles polymer composites at the same contents of carbon nanoparticles, and contribution of absorption to the shielding efficiency was found to be higher than that of reflection.

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Section: Compositesupporting

confidence: 58%

Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

2011

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“…For example, in the traditional injection molding, the process parameters significantly influence the electrical conductivity of molded composites [26]. Additionally, in 3D printing, FDM produces 3D objects by extruding thermoplastic materials and depositing the semi-molten materials onto a stage layer by layer.…”

Section: Introductionmentioning

confidence: 99%

Resistivity and Its Anisotropy Characterization of 3D-Printed Acrylonitrile Butadiene Styrene Copolymer (ABS)/Carbon Black (CB) Composites

Zhang

Yang

et al. 2017

Applied Sciences

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Abstract:The rapid printing of 3D parts with desired electrical properties enables numerous applications. Fused deposition modeling (FDM) using conductive thermoplastic composites has been a valuable approach for such fabrication. The parts produced by FDM possess various controllable structural features, but the effects of the structural features on the electrical properties remain to be determined. This study investigated the effects of these features on the electrical resistivity and resistivity anisotropy of 3D-printed ABS/CB composites. The effects of the process parameters of FDM, including the layer thickness, raster width, and air gap, on the resistivity in both the vertical and horizontal directions for cubic samples were studied because the internal structure of the printed parts depended on those process parameters. The resistivities of printed parts in different parameter combinations were measured by an impedance analyzer and finite element models were created to investigate the relationship between the resistivity and the internal structure. The results indicated that the parameters remarkably affected the resistivity due to the influence of voids and the bonding condition between adjacent fibers. The resistivity in the vertical direction ranged from 70.40 ± 2.88 Ω·m to 180.33 ± 8.21 Ω·m, and the resistivity in the horizontal direction ranged from 41.91 ± 2.29 Ω·m to 58.35 ± 0.61 Ω·m at the frequency of 1 kHz. Moreover, by adjusting the resistivities in different directions, the resistivity anisotropy of the printed parts can be manipulated from 1.01 to 3.59. This research may serve as a reference to fabricate parts with sophisticated geometry with desired electrical resistivity and resistivity anisotropy.

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“…Above a critical frequency, electron hopping is no longer the dominant mechanism but conductivity results from Resistive-Capacitive (RC) coupling between filler and matrix, which can be described by equivalent circuits [5,[25][26][27]. EMI shielding CNT-based polymer nanocomposites based on, for example, polycarbonate, polycaprolactone, polypropylene and polystyrene have already been described [20,21,[28][29][30]. They still mostly work by reflection, not absorption.…”

Section: Introductionmentioning

confidence: 99%

Polypropylene Carbon Nanotubes Nanocomposites: Combined Influence of Block Copolymer Compatibilizer and Melt Annealing on Electrical Properties

Emplit

Tao

Lipnik

et al. 2017

Journal of Nanomaterials

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We study the influence of melt annealing and the presence of a block copolymer compatibilizer on the electrical properties of polypropylene carbon nanotubes (CNT) nanocomposites from the DC limit to microwave frequencies and link it to the morphological details. We show that the compatibilizer concentration controls three types of morphologies: separate CNT agglomerates, a network of well dispersed but interconnected CNT, and individualized but separate nanotubes. This explains why conductivity reaches an optimum over the whole frequency range at a low compatibilizer concentration. We model the corresponding structures by a semiquantitative schematic equivalent electrical circuit. A key outcome of the work is the understanding and control of dispersion mechanisms in order to optimize the electrical performances for efficient EMI shielding depending on the targeted frequency range.

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The electrical conductivity and electromagnetic interference shielding of injection molded multi-walled carbon nanotube/polystyrene composites

Cited by 288 publications

References 21 publications

Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

Electromagnetic Interference Shielding Efficiency in the Range 8.2-12.4 GHz of Polymer Composites with Dispersed Carbon Nanoparticles

Resistivity and Its Anisotropy Characterization of 3D-Printed Acrylonitrile Butadiene Styrene Copolymer (ABS)/Carbon Black (CB) Composites

Polypropylene Carbon Nanotubes Nanocomposites: Combined Influence of Block Copolymer Compatibilizer and Melt Annealing on Electrical Properties

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