Polyvinylidene fluoride/nanocrystalline iron composite materials for EMI shielding and absorption applications

Gargama, Heeralal; Thakur, Awalendra K.; Chaturvedi, Sanjay K.

doi:10.1016/j.jallcom.2015.09.059

Cited by 84 publications

(24 citation statements)

References 43 publications

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“…Therefore materials with high electrical conductivities (high permittivity) and high magnetic permeability are ideal. For example, when an electrically conducting material is exposed to electric field, displacement of free electrons leads to space charge polarization/dielectric relaxation and power loss . Similarly, materials with high magnetic permeability provide an effective pathway for magnetic field, thereby shielding the EM radiations.…”

Section: Resultsmentioning

confidence: 99%

Highly conductive PP/PET polymer blends with high electromagnetic interference shielding performances in the presence of thermally reduced graphene nanosheets prepared through melt compounding

2018

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In this study, we have prepared highly conductive polypropylene (PP)/poly(ethylene terephthalate) (PET) blends with high electromagnetic interference (EMI) shielding performances by incorporating very low contents of thermally reduced graphene (TRG) through melt compounding method. Based on scanning electron microscopy and transmission electron microscopy images, the blends exhibited co‐continuous morphologies in which TRG nanosheets had been thermodynamically and kinetically driven into PET polymer resulting in a double percolated structure. Both direct current and AC electrical conductivities of the blend nanocomposites significantly increased with TRG addition and a dramatically low electrical percolation threshold of 0.08 vol% was achieved. Electromagnetic properties were investigated by measuring complex permittivity and complex permeability of the samples in the X‐band frequency range (8.2–12.4 GHz). The EMI shielding effectiveness considerably increased with increasing TRG loading and depending on the frequency, a shielding effectiveness of 40–60 dB was obtained with incorporation of only 2 vol% of TRG. POLYM. COMPOS., 40:E1461–E1469, 2019. © 2018 Society of Plastics Engineers

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Section: Resultsmentioning

confidence: 99%

Highly conductive PP/PET polymer blends with high electromagnetic interference shielding performances in the presence of thermally reduced graphene nanosheets prepared through melt compounding

2018

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“…The rectangular samples with 0.5 mm thickness were placed between the two ports of the waveguide to perform the measurement in the 8.2-12.4 GHz frequency range. During this study, the S parameters (S 11 , S 12 , S 21 , S 22 ) were recorded to calculate the total SE, shielding by absorption and shielding by reflection of the PVDF-PFR composites.…”

Section: Characterizationmentioning

confidence: 99%

“…Porous polydimethylsiloxane (PDMS)/graphene foam depicts 20 dB EMI SE at 0.8 wt% grapheme loading with 1 mm thickness, reported by Chen et al [21] In this work particulate leaching technique was followed where NaCl was mixed and leached out to create porous structure in the composite. The properties ((easy processing, flexibility, high dielectric strength (~13 kV·mm -1 ), high thermal stability, good chemical resistance, low density (1.76 g·cm -3 ), excellent mechanical properties, in addition its well-known ferroelectric, piezoelectric and pyroelectric properties)) [22,23] of poly(vinylidene fluoride) (PVDF) makes it very applicable for the said purpose [24,25]. …”

Section: Introductionmentioning

confidence: 99%

NaCl leached sustainable porous flexible Fe3O4 decorated RGO-polyaniline/PVDF composite for durable application against electromagnetic pollution

Bera¹,

Paria²,

Karan³

et al. 2017

Express Polym. Lett.

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Abstract.To avoid the interference of electromagnetic radiation from other devices, an electronic device needs to be fabricated with flexible and light weight electromagnetic interference (EMI) shielding materials with high efficiency. According, highly flexible porous poly(vinylidene fluoride) (PVDF)/PFR (Fe 3 O 4 decorated polyaniline/RGO composite) composite was prepared through solution blending of PVDF with pre-synthesized PFR conductive composite that involves in-situ oxidative polymerization of aniline in the presence of reduced graphene oxide (RGO) using FeCl 3 as oxidant. The porous morphology of the composite was created by leaching out of mixed NaCl from the composite. Polyaniline and RGO were mutually decorated by chemically in-situ synthesized ferrosoferric oxide (Fe 3 O 4 ) using the Fe source of FeCl 3 . A homogeneous dispersion of PFR in insulated PVDF matrix resulted in a highly electrical conductive composite (PVDF-PFR) material through formation of three dimensional continuous conductive networks of polyaniline-RGO in the matrix phase. The composite shows an outstanding EMI shielding effectiveness (EMI SE) property due to the porous structure and the presence of conductive network and ferromagnetic Fe 3 O 4 nanoparticles. The PVDF-PFR composite (0.5 mm thickness) depicts a great permittivity and permeability value and achieve high EMI SE value (≈-28.18 dB) and conductivity value of ≈1.10·10 -1 S·cm -1 at very low loading (5 wt%) of RGO.

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“…Such features require hardware that has a great electrical performance, heat transfer efficiency, and that is lightweight [ 1 ]. Meanwhile, electromagnetic (EM) waves pollution generated from these devices could be harmful to human health and should be isolated and limited [ 2 , 3 , 4 , 5 ]. Hence, it is imperative to develop multifunctional materials that meet such application requirements.…”

Section: Introductionmentioning

confidence: 99%

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

et al. 2020

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The applications of pure multi-walled carbon nanotubes (MWCNTs) buckypapers are still limited due to their unavoidable micro/nano-sized pores structures. In this work, polyvinyl alcohol (PVA) was added to a uniform MWCNTs suspension to form MWCNT/PVA buckypapers by vacuum infiltration combined with a hot press method. The results showed an improvement in the thermal, electrical, and electromagnetic interference (EMI) shielding properties due to the formation of dense MWCNTs networks. The thermal and electrical properties rose from 1.394 W/m·k to 2.473 W/m·k and 463.5 S/m to 714.3 S/m, respectively. The EMI performance reached 27.08 dB. On the other hand, ABAQUS finite element software was used to simulate the coupled temperature-displacement performance. The electronic component module with buckypapers revealed a homogeneous temperature and thermal stress distribution. In sum, the proposed method looks promising for the easy preparation of multi-functional nanocomposites at low-cost.

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Polyvinylidene fluoride/nanocrystalline iron composite materials for EMI shielding and absorption applications

Cited by 84 publications

References 43 publications

Highly conductive PP/PET polymer blends with high electromagnetic interference shielding performances in the presence of thermally reduced graphene nanosheets prepared through melt compounding

Highly conductive PP/PET polymer blends with high electromagnetic interference shielding performances in the presence of thermally reduced graphene nanosheets prepared through melt compounding

NaCl leached sustainable porous flexible Fe3O4 decorated RGO-polyaniline/PVDF composite for durable application against electromagnetic pollution

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

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