Electrical and electromagnetic interference shielding properties of flow-induced oriented carbon nanotubes in polycarbonate

Arjmand, Mohammad; Mahmoodi, Mehdi; Gelves, Genaro A.; Park, Simon; Sundararaj, Uttandaraman

doi:10.1016/j.carbon.2011.04.039

Cited by 356 publications

(218 citation statements)

References 38 publications

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“…Yang et al 6 found that with the addition of 1 wt% CNTs into a 10 wt% carbon nanober/polystyrene (PS) composite, SE value of 20.3 dB was obtained for a 1 mm thick sample. Arjmand et al 7 studied the EMI shielding properties of MWCNT/polycarbonate (PC) composites and obtained EMI SE values of about 25 dB for 5 wt % MWCNT/PC composites. However, most of these studies do not discuss the mechanical properties of composites tested for EMI shielding properties except our own studies on EMI shielding properties of MWCNT/PMMA and MWCNT/PS composites.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

Pande¹,

Chaudhary²,

Patel³

et al. 2014

RSC Adv.

170

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Home-made multiwall carbon nanotubes (MWCNTs) were used as a reinforcing conducting filler for a thermoplastic polymer, polycarbonate (PC) and the mechanical and electrical properties of the composites were investigated for electrostatic discharge (ESD) and electromagnetic interference (EMI) shielding applications. A uniformly dispersed MWCNT/PC composite system was fabricated using solvent casting and a combination of solvent casting and compression molding techniques. The effect of MWCNTs on the failure mechanism of the polymer under tensile loading showed a ductile to brittle transition with increasing amount of carbon nanotubes. ESD studies showed that the composite films of 2 and 5 wt% functionalized-MWCNT/PC with respective charge decay times of 1 and 0.6 s show promise as electrostatic dissipative materials. EMI shielding effectiveness of a five-layered system ($2 mm thickness) of as-synthesized-MWCNT/PC composite films at 20 wt% loading reached 43 dB in the X-band (8.2-12.4 GHz). The primary mechanism of shielding was absorption, suggesting possible use as an EMI absorbing material. By using low pressure (contact pressure) compression molding the EMI shielding properties of bulk composites ($2 mm thickness) improved by about 14 dB at 10 wt% MWCNT loading.

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Section: Introductionmentioning

confidence: 99%

“…There are several studies on EMI shielding properties of CNT/polymer composites 2,4-6,8,9,24,34-40 and a few studies on EMI shielding properties of CNT/PC composites. 7,41 The studies show EMI SE of composite increases with increase in CNT loading or electrical conductivity. Moreover in most of these studies EMI shielding is dominated by absorption.…”

mentioning

confidence: 99%

Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

Pande¹,

Chaudhary²,

Patel³

et al. 2014

RSC Adv.

170

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show abstract

“…They still mostly work by reflection, not absorption. Recently, effective EM absorbing structures based on polymer-CNT nanocomposites have been described [21,[31][32][33].…”

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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“…Conductive polymer composites (CPCs) are becoming promising candidates to be employed as EMI shields as they offer light weight, low cost, good processability, and high resistance to corrosion and various CPCs containing micro-sized [4][5][6][7][8][9], and nano-sized [10][11][12][13][14][15] fillers have been developed for EMI shielding applications. However, CPCs are not yet very successful in replacing metal-based shields due to the required high filler loading.…”

Section: Introductionmentioning

confidence: 99%

Foam injection molding of polypropylene/stainless steel fiber composites for efficient EMI shielding

Ameli¹,

Nofar²,

Wang³

et al. 2016

AIP Conference Proceedings

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Electrical and electromagnetic interference shielding properties of flow-induced oriented carbon nanotubes in polycarbonate

Cited by 356 publications

References 38 publications

Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

Mechanical and electrical properties of multiwall carbon nanotube/polycarbonate composites for electrostatic discharge and electromagnetic interference shielding applications

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

Foam injection molding of polypropylene/stainless steel fiber composites for efficient EMI shielding

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