Effect of silver incorporation into PVDF-barium titanate composites for EMI shielding applications

Joseph, Nina; Singh, Santosh Kumar; Sirugudu, Roopas Kiran; Murthy, V. R. K.; Ananthakumar, S.; Sebastian, Mailadil Thomas

doi:10.1016/j.materresbull.2012.11.115

Cited by 149 publications

(49 citation statements)

References 29 publications

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“…Fundamental understanding of these parameters is very important to achieve the optimum EMI shielding properties. Polyvinylidene fluoride (PVDF) is a well-known ferroelectric polymer material with good chemical resistance, low density and physical flexibility [2,27,28]. In the present investigation, graphite flakes (Gp) were added in different volume percentages into the PVDF matrix and the EMI shielding effectiveness of both the composites are measured.…”

Section: Introductionmentioning

confidence: 99%

“…This problem mainly arises due to the increase in use of high operating frequency and bandwidth in electronic systems especially in the X, Ku band range and broadband frequencies. Hence, EMI shielding materials find application in today's civilian and military technology [1,2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Conventionally, metals and metallic composites are widely used as effective materials for shielding applications. The metal-based composites are heavier and prone to corrosion, whereas polymer composites are lightweight with design flexibility and ease of processing [2][3][4][5][6][7]. They have good EMI shielding performance and hence are promising material as alternative to metals for EMI protection.…”

Section: Introductionmentioning

confidence: 99%

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Graphite reinforced polyvinylidene fluoride composites an efficient and sustainable solution for electromagnetic pollution

Joseph

Varghese

Sebastian

2017

Composites Part B: Engineering

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Graphite flakes reinforced polyvinylidene fluoride (PVDF) composites were prepared and investigated the influence of DC (Direct Current), AC (Alternating Current) conductivity, sample thickness as well as presence of conductive layer on its electromagnetic interference (EMI) shielding effect. The graphite incorporated PVDF composites with sample a thickness of 1 mm exhibit good shielding properties of about 45-55 dB in the frequency range of 8.2-18 GHz for highest filler loading. These composites exhibit absorption as the primary mechanism for EMI shielding. Addition of graphite decreases the coefficient of thermal expansion (CTE) and improve the mechanical properties. The EMI shielding effect improved with increase in sample thickness and by incorporating a conductive layer to the graphite flake composite. The graphite flake based composites are found to be lightweight, thin and good EMI shielding materials that can be tuned to wide range of shielding applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Graphite reinforced polyvinylidene fluoride composites an efficient and sustainable solution for electromagnetic pollution

Joseph

Varghese

Sebastian

2017

Composites Part B: Engineering

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“…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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“…However, there is a contradiction between striving for increase in ε (due to rise in filler amount) and the corresponding increase in losses in a dielectric composite. For instance, a number of studies of ferroelectric/polymer composites containing BaTiO 3 as a ferroelectric component [5,18,[27][28][29][30][31] demonstrated that the achieved values of dielectric permittivity ε in these composites range from 40 to 200 (depending on preparation technique and ferroelectric filler concentration). The values of filler load did not exceed 30 vol.%.…”

mentioning

confidence: 99%

Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix

et al. 2020

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The polycondensation of 5,5-methylene bis(2-aminophenol) and the mixture of diamines 5,5-methylene bis(2-aminophenol) and 4,4-(hexafluoroisopropylidene)dianiline (molar ratio 0.8:0.2) with isophthaloyl dichloride was used to synthesize a new heat resistant binder of the composites for microelectronics: poly(o-hydroxyamide) (POA) and poly(amido-o-hydroxy amide) (POA-F). The thermal stability of synthesized polymer coatings, as well as based on them photosensitive compositions with a naphthoquinondiazide photosensitive component were studied in the temperature range from 100 to 500 °C. Ferroelectric composites with nanodispersed lead titanate zirconate powder filler were formed based on these polymer matrices. By manipulating the conditions of the polymer formation, we obtained matrices with different stiffnesses, which reflected on the properties of the composite. The electrophysical parameters of the synthesized polymer and ferroelectric composite coatings were measured in the frequency range from 0.1 Hz to 1.5 GHz and the temperature range from 0 to 300 °C. The frequency and temperature stability of the dielectric constant of ferroelectric composite coatings up to 10 MHz and 300 °C, respectively, are noted. The influence of the composition and structure of the polymer matrix and the grain/matrix interfaces on the thermal stability of the dielectric parameters of composite films is estimated. The shift of the phase transition region toward higher temperatures in the composite structure, as well as the sufficient rigidity of the poly(benzoxazole) matrix, provide high temperature and frequency stability of the dielectric constant of the studied composites.

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Effect of silver incorporation into PVDF-barium titanate composites for EMI shielding applications

Cited by 149 publications

References 29 publications

Graphite reinforced polyvinylidene fluoride composites an efficient and sustainable solution for electromagnetic pollution

Graphite reinforced polyvinylidene fluoride composites an efficient and sustainable solution for electromagnetic pollution

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

Composite Ferroelectric Coatings Based on a Heat-Resistant Polybenzoxazole Polymer Matrix

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