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

Joseph, Nina; Varghese, Jobin; Sebastian, Mailadil Thomas

doi:10.1016/j.compositesb.2017.05.030

Cited by 62 publications

(26 citation statements)

References 38 publications

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“…Various polymer composite formulations, i.e., different filler types and polymer matrixes, as well as mechanisms towards electromagnetic attenuation have been recently reviewed [5][6][7][8]. The most common processing routes for the development of electrically conductive polymer composites for EMI shielding applications are solvent casting [9][10][11][12] and melt-mixing followed by compression-molding [13][14][15][16]. Nevertheless, solvent casting remains limited to lab-scale.…”

Section: Introductionmentioning

confidence: 99%

Rapid Prototyping of Efficient Electromagnetic Interference Shielding Polymer Composites via Fused Deposition Modeling

et al. 2018

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Acrylonitrile–butadiene–styrene (ABS) filled with 6 wt.% of multi-walled carbon nanotubes and graphene nanoplatelets was extruded in filaments and additively manufactured via fused deposition modeling (FDM). The electrical conductivity and electromagnetic interference shielding efficiency (EMI SE) in the frequency range between 8.2 and 12.4 GHz of the resulting 3D samples were assessed. For comparison purposes, compression molded samples of the same composition were investigated. Electrical conductivity of about 10−4 S·cm−1 and attenuations of the incident EM wave near 99.9% were achieved for the 3D components loaded with multi-walled carbon nanotubes, almost similar to the correspondent compression molded samples. Transmission electron microscopy (TEM) images of ABS composite filaments show that graphene nanoplatelets were oriented along the polymer flow whereas multi-walled carbon nanotubes were randomly distributed after the extrusion process. The electrical conductivity and electromagnetic interference (EMI) shielding properties of compression molded and FDM manufactured samples were compared and discussed in terms of type of fillers and processing parameters adopted in the FDM process, such as building directions and printing patterns. In view of the experimental findings, the role of the FDM processing parameters were found to play a major role in the development of components with enhanced EMI shielding efficiency.

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Section: Introductionmentioning

confidence: 99%

Rapid Prototyping of Efficient Electromagnetic Interference Shielding Polymer Composites via Fused Deposition Modeling

et al. 2018

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“…Compositions with different relative permittivity but about the same sintering temperature are in great demand for multilayer applications. A simple and useful approach to obtain material with desired properties is by composite approach, which is widely utilized for many applications [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Joseph

Varghese

Teirikangas

et al. 2018

Composites Part B: Engineering

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The present paper presents ceramic composites with ultralow sintering temperature of 500 ̊C with densification of 96 % by adding small amount (0.5, 1 and 2 wt.%) of Ag2O to CuMoO4 by simple mixing method. The effect of Ag2O addition on the structure, microstructure, sintering and thermal as well as microwave dielectric properties of CuMoO4 is also studied. The reduction in the sintering temperature is due to the formation of trace amount (1.4%) of copper silver molybdate (Cu2Ag2(MoO4)3) as observed from Rietveld refinement analysis as well as backscattered SEM image. Doping has very little influence on the structure and coefficient of thermal expansion that is about 4.7-5.2 ppm/C. The composites sintered at 500 ̊C exhibit relative permittivity of about 8-9, quality factor (Qf) of 26000-37000 GHz at 12 GHz, temperature coefficient of resonant frequency of-31-33 ppm/C and are compatible with Al electrode. The present work results in obtaining welldensified ultralow temperature cofired ceramic composites at low sintering temperature without much structural change and good thermal properties but with different dielectric properties by small doping. These composites can be used as low cost candidates for wide range of microwave applications like multilayer packages and substrates owing to the low energy required during processing and hence can pave way to the advancement of electronic materials.

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“…Joseph et al synthesized a simple, lightweight and low-cost electromagnetic shielding material by incorporating graphite flakes in polyvinylidene fluoride (PVDF). 58 The shielding mechanism is mainly due to absorption, and a material of 0.5-mm thickness shows EMI shielding effectiveness (EMI SE) of more than 50 dB. They continued the investigation on electromagnetic shielding materials and developed a flexible, low-cost electromagnetic shielding fabric.…”

Section: Carbon-based Materialsmentioning

confidence: 99%

Applications of Microwave Materials: A Review

Raveendran

Sebastian

Raman

2019

Journal of Elec Materi

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136

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The performance of microwave devices mainly depends on the properties of materials used in the fabrication. Knowledge of material properties at microwave frequencies is a prerequisite to select suitable materials for various microwave applications and vice versa. In this review, seven categories of materials and their applications in a microwave regime are elaborately discussed. The categories include magnetic materials, carbon-based materials, flexible or stretchable materials, biomaterials, phantoms, tunable materials and metamaterials. A brief overview of other important microwave materials such as low-loss ceramic dielectric materials, low-loss polymer ceramic composites, glass ceramics and multilayer ceramics is also given. The objective of this review is to expose the world of materials for wide microwave applications and thereby properly assisting the material selection for specific applications. Moreover, this review has dual significance. It helps material scientists to develop new materials and modify the properties of the available materials with respect to the application requirements. It also assists microwave engineers to select and use appropriate materials for different microwave applications.

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

Cited by 62 publications

References 38 publications

Rapid Prototyping of Efficient Electromagnetic Interference Shielding Polymer Composites via Fused Deposition Modeling

Rapid Prototyping of Efficient Electromagnetic Interference Shielding Polymer Composites via Fused Deposition Modeling

Ultra-low sintering temperature ceramic composites of CuMoO4 through Ag2O addition for microwave applications

Applications of Microwave Materials: A Review

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