Mechanically robust conductive carbon clusters confined ethylene methyl acrylate–based flexible composites for superior shielding effectiveness

Bhawal, Poushali; Ganguly, Sayan; Das, Tushar Kanti; Mondal, Subhadip; Das, Poushali

doi:10.1002/pat.4092

Cited by 66 publications

(32 citation statements)

References 79 publications

(138 reference statements)

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“…Skin effect, ie, the penetration of EM wave into the surface of the shielding material is an important factor to be considered in designing an EMI absorbing material. Skin depth defines the depth of penetration that can reduce the EM wave to its 1/e value and is expressed as

δ = \frac{1}{\sqrt{πfσ} μ} = - 8.68 ([], \frac{t}{{SE}_{A}})

where, f is the frequency, and σ and μ are the electrical conductivity and permeability of the material respectively. Skin depth decreases with the increase in absorption.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of double percolated co‐supportive MWCNT‐CB conductive network for high‐performance EMI shielding application

Ravindren

Mondal

Nath

et al. 2019

Polymers for Advanced Techs

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The recent development in telecommunication technology has led electromagnetic interference (EMI) to a serious threat to both electronic devices and living beings. In this work, we designed a highly efficient EMI shielding material by taking advantage of both carbonaceous hybrid filler and double percolation phenomenon. Here, a flexible, lightweight microwave absorbing conductive polymer composite was fabricated by employing poly (ethylene‐co‐methyl acrylate) and ethylene octene copolymer (EMA/EOC) binary blend as the matrix and multiwall carbon nanotube carbon black (MWCNT/CB) hybrid filler as the conductive moiety. We investigated the effect of MWCNT content in the hybrid composite on mechanical, thermomechanical, electrical, and shielding efficiency. A total EMI shielding efficiency of −37.4 dB in the X band region was attained with 20 wt% hybrid filler containing 50 wt% MWCNT along with promising mechanical properties.

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δ = \frac{1}{\sqrt{πfσ} μ} = - 8.68 ([], \frac{t}{{SE}_{A}})

where, f is the frequency, and σ and μ are the electrical conductivity and permeability of the material respectively. Skin depth decreases with the increase in absorption.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effect of double percolated co‐supportive MWCNT‐CB conductive network for high‐performance EMI shielding application

Ravindren

Mondal

Nath

et al. 2019

Polymers for Advanced Techs

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“…Physics of EM wave reflection and absorption, particularly in a granular or composite sample, is complex. Nevertheless, it has been discussed in texts and few papers, achieving partial understanding of the processes.…”

Section: Selective Overview and Materials Selectionmentioning

confidence: 99%

“…Electromagnetic Interference (EMI) shielding efficiency (SE) is highest for suitable metal sheets. But to make the shield flexible and light, the world is innovating polymer composites as the 2nd generation group of EMI shielding materials . Moreover, polymers including plastics have now reduced the dominating role of metals and alloys in the world of practical materials.…”

Section: Introductionmentioning

confidence: 99%

Polymer Composites for Flexible Electromagnetic Shields

Sahu¹,

De²

2018

Macromolecular Symposia

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Harmful electromagnetic (EM) interference (EMI) to living beings and various sensitive instruments by EM radiations from electronic and electrical gadgets and mobile towers is increasing rapidly. It inflicts illness, and presumably cancerous growth in human cells. EMI is minimized by wrapping the receiver and/or the emitter gaplessly by an efficient EM shielding sheet. Compared to the widely used and classical metallic shields, 2nd generation polymer composite EMI shields are lighter and more flexible. Conventional polymer composites use conducting polymers and metallic/carbon powders that have conducting electrons to reflect EM waves away. A polymeric binder, curing overnight to a soft and flexible sheet, has presently been selected for making the polymeric composites. We test EM shielding by certain non‐metallic composites. We review results for composites with fine metallic fibers (copper and brass turnings, available as waste from mechanical workshops) or conducting forms of cadmium oxide or ferroelectric materials (PbNb2O6 [o‐PN] & BaTiO3 [BT]) or their mixtures (52 samples). Small pieces of these cloth‐like polymeric sheets have been characterized in a Vector Network Analyzer (VNA), by measuring input power (Pin), the reflected power (Prefl), and the transmitted power (Pout), over five frequency bands in 700 MHz to 40 GHz range to find Shielding Effectiveness (SE) = 10 log (Pout/Pin) and Reflection Effectiveness = 10 log (Prefl/Pin). Success of o‐PN, BT, conducting (fired) Cd‐O, metallic turnings and their combinations has been discussed, highlighting some new observations. Composites, developed in this work, include EMI Shielding materials and potential Radar Absorption Materials.

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“…Bhawal et al . developed an efficient EMI shielding material based on ethylene methyl acrylate (EMA) and Vulcan XC 72 conductive carbon black and investigated filler dispersion and distribution in the polymer matrix. In this work, we use Vulcan XC 72‐high structured carbon black as the cost‐effective conductive filler.…”

Section: Introductionmentioning

confidence: 99%

Superior electromagnetic interference shielding effectiveness and low percolation threshold through the preferential distribution of carbon black in the highly flexible polymer blend composites

et al. 2018

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Carbon black distribution in different phases of blends affects the percolation threshold and electrical properties and electromagnetic interferences (EMIs) shielding effectiveness to a great extent. We addressed the challenge of developing a light weight and highly flexible superior EMI shielding material by combining ethylene methyl acrylate (EMA) and ethylene octane copolymer (EOC) with conductive carbon black. The selective distribution of filler particle in the EMA phase facilitates the way for double percolation phenomenon which signifies higher electrical conductivity properties. This percolated filler network development is revealed from the field emission scanning electron microscopy and TEM analysis. This newly developed conductive blend demonstrates superior EMI shielding efficiency of −31.4 dB together with promising mechanical and thermal properties. POLYM. COMPOS., 40:1404–1418, 2019. © 2018 Society of Plastics Engineers

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Mechanically robust conductive carbon clusters confined ethylene methyl acrylate–based flexible composites for superior shielding effectiveness

Cited by 66 publications

References 79 publications

Synergistic effect of double percolated co‐supportive MWCNT‐CB conductive network for high‐performance EMI shielding application

Synergistic effect of double percolated co‐supportive MWCNT‐CB conductive network for high‐performance EMI shielding application

Polymer Composites for Flexible Electromagnetic Shields

Superior electromagnetic interference shielding effectiveness and low percolation threshold through the preferential distribution of carbon black in the highly flexible polymer blend composites

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