Investigation of electrical conductivity and electromagnetic interference shielding effectiveness of preferentially distributed conductive filler in highly flexible polymer blends nanocomposites

Ravindren, Revathy; Mondal, Subhadip; Nath, Krishnendu; Das, Poushali

doi:10.1016/j.compositesa.2018.12.012

Cited by 117 publications

(93 citation statements)

References 52 publications

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“…From the DSC curve, a reduction in melting endotherm and crystallization exotherm is found for the hybrid composite, and this reduction is more pronounced in peaks corresponding to EMA which indicates the localization of the hybrid filler particle in the EMA phase. The preferential localization of the hybrid filler can be related to their polar nature and surface energy matching between the fillers and the polymer . Table gives the surface energy data of blend components and fillers .…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2B,C shows the photographic images of the flexible hybrid composite containing CB and MWCNT in the ratio 50:50. matching between the fillers and the polymer. 37 Table 2 gives the surface energy data of blend components and fillers. 36 The temperature dependence of storage modulus, E′, is depicted in Figure 4A, and the results obtained at −50°C, 0°C, and + 50°C are tabulated in Table 3.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

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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“…According to classical percolation theory, the relationship between the electrical conductivity of the nanocomposite (σ) and the MWCNT content (ϕ) can be evaluated by a power law equation:

σ = σ_{0} {(φ - φ_{c})}^{t}

…”

Section: Resultsmentioning

confidence: 99%

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming

Zhao

Wang

et al. 2019

Macro Materials & Eng

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Poly(methyl methacrylate) (PMMA) foams exhibit many advantages over the most popular polystyrene (PS) foams, which make them an ideal candidate for thermal insulation application. First, PMMA has lower carbon content, lower burning rate, smaller heat release rate, and lower smoke emission than PS. [7] So, PMMA foams need less flame retardants than PS foams when used as construction thermal insulation materials, which helps reduce the overall production costs and mitigate the greenhouse effect. Second, PMMA can strongly absorb infrared light in the wavelength range of 2.8-25 µm, [8] while PS can hardly absorb infrared light. Thus, the low-density PMMA foams are expected to block more thermal radiations than the PS foams with the same density. Third, PMMA has higher CO 2 solubility than PS because the carbonyl group in PMMA has stronger adsorption capacity for CO 2 than the benzene ring in PS. [9] The higher CO 2 solubility makes it much easier to prepare low-density PMMA foam, enhancing foam's thermal insulation. Carbon nanotubes (CNTs) with unique electrical, mechanical, and thermal properties have exhibited great value in designing electrical conductive composites, [10,11] electromagnetic interference shielding, [12,13] and energy harvesting materials. [14] These excellent properties of CNTs also make them ideal fillers to design polymer foams for some important reasons. First, CNTs are excellent heterogeneous nucleating agent to increase the cell density. Cell nucleation is more likely to occur at the interfaces between fillers and polymer matrix because of the relatively low free energy barrier for heterogeneous nucleation. [15][16][17] Due to their high aspect ratio and specific area, uniformly dispersed CNTs can offer much more interfaces as the heterogeneous nucleation sites than many other spherical (i.e., nano SiO 2 [18] ) or lamellar fillers (i.e., nano clay [19] ). Moreover, CNTs can endow the polymer foams with multifunctionality by offering the same advantages that they offer in the bulk while not decreasing foam's other properties. For example, CNTs are one kind of good wave-absorbing material that can be recognized as black bodies. In electromagnetic fields, CNTs can attenuate electromagnetic radiation by forming a conductive network (conductivity loss), [12,20] or by the polarization of CNT/polymer interfaces (dielectric loss), [21,22] or by scattering and multiple Polymer Nanocomposite Foaming behavior of poly(methyl methacrylate) (PMMA)/multi-walled carbon nanotubes (MWCNTs) nanocomposites and thermally-insulating, electrical, and mechanical properties of the nanocomposite foams are investigated. PMMA/MWCNT nanocomposites containing various amounts of MWCNTs are first prepared by combining solution and melt blending methods, and then foamed using CO 2 . The foaming temperature and MWCNT content are varied for regulating the structure of PMMA/MWCNT nanocomposite foams. The electrical conductivity measurement results show that MWCNTs have little effect on the electrical conductivity of foams with l...

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“…These factors can also affect functions of human body, mainly when organisms are exposed to them for a longer time . Therefore, there is a great need for EMR shielding of electronic and radiation sources …”

Section: Introductionmentioning

confidence: 99%

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

Kruželák

Kvasničáková

Ušák

et al. 2020

Polymers for Advanced Techs

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Rubber magnetic composites were prepared through the incorporation of magnetic soft lithium ferrite into acrylonitrile butadiene rubber. Standard sulfur-based curing and peroxide curing systems were used for cross-linking of rubber matrices. The experimental part was focused on the investigation of ferrite content and curing system composition on cross-link density, physical-mechanical, magnetic and shielding characteristics of composites. The results demonstrated that cross-link density and physical-mechanical properties of composites can be modified by both the amount of ferrite and composition of the curing system. The influence of curing systems on magnetic properties was negligible. It can be stated that the application of lithium ferrite to rubber matrix leads to the preparation of rubber composites with the ability to efficiently absorb harmful electromagnetic radiation in the tested frequency range. The shielding efficiency of composites increased with increasing content of magnetic filler. K E Y W O R D S electromagnetic radiation shielding, magnetic filler, peroxide curing, rubber magnets, sulfur curing

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Investigation of electrical conductivity and electromagnetic interference shielding effectiveness of preferentially distributed conductive filler in highly flexible polymer blends nanocomposites

Cited by 117 publications

References 52 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

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

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Investigation of electrical conductivity and electromagnetic interference shielding effectiveness of preferentially distributed conductive filler in highly flexible polymer blends nanocomposites

Cited by 117 publications

References 52 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

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO2 Foaming

Rubber magnets based on NBR and lithium ferrite with the ability to absorb electromagnetic radiation

Contact Info

Product

Resources

About

Thermal‐Insulation, Electrical, and Mechanical Properties of Highly‐Expanded PMMA/MWCNT Nanocomposite Foams Fabricated by Supercritical CO₂ Foaming