Abstract:Lightweight, flexible and low-cost electromagnetic interference (EMI) shielding materials with high shielding effectiveness (SE) have attracted considerable attention for next-generation portable and wearable electronics. In this work, high performance polymer...
“…Our newly explored nanocomposites showed higher EMI SE values, in the X-band (8.2–12.4 GHz), compared to serval thermoplastic and thermosetting systems containing EG conductive fillers, such as polyurethane, novalac resin and epoxy as reported in the literature (see Table 2). 55–66 Figure 7.Experimental total EMI-SE of the polybenzoxazine/EG nanocomposites at various EG ratios.…”
Section: Resultsmentioning
confidence: 99%
“…Our newly explored nanocomposites showed higher EMI SE values, in the X-band (8.2-12.4 GHz), compared to serval thermoplastic and thermosetting systems containing EG conductive fillers, such as polyurethane, novalac resin and epoxy as reported in the literature (see Table 2). [55][56][57][58][59][60][61][62][63][64][65][66] Table 3 collects the experimental data on the total EMI SE average, SE A , and the SE R for the developed nanocomposites at various EG ratios. It is clearly appeared that, as the content of EG increased in these nanocomposites, both the SE A and SE R are increased, while the contribution of reflection mode is more dominant after the percolation threshold.…”
Section: Electrical Conductivity Of Polybenzoxazine/ Eg Nanocompositesmentioning
The thermal, the electrical conductivity, and electromagnetic shielding properties of low cost high-performance expanded graphite (EG)-filled polybenzoxazine matrix nanocomposites produced by a solution blending and compression molding technique were investigated. At 2.26 vol.% EG, a percolation threshold was detected, at which the electrical conductivity increased by nine orders of magnitude in comparison to the unfilled matrix. The electrical conductivity values increased from 1.35 S.cm−1 to 28.3 S.cm−1 by increasing the EG ratios in the nanocomposites from 7 wt.% and 15 wt.%. In addition, the morphological analysis results revealed good nanofiller dispersion and the formation of 3D-conductive pathways of EG into the polybenzoxazine matrix, which are responsible for the electrical conductivity improvement. Moreover, the electromagnetic interference (EMI) shielding efficiencies, in the X-band, of these nanocomposites have been significantly improved, reaching 57.2 dB at a 15 wt.% EG ratio. Furthermore, the inclusion of EG nanofiller significantly improved the thermal properties of the nanocomposites in terms of first degradation temperatures, char yields, and thermal conductivities. Because of these exceptional properties, these nanocomposites are ideal for high thermal EMI shielding applications.
“…Our newly explored nanocomposites showed higher EMI SE values, in the X-band (8.2–12.4 GHz), compared to serval thermoplastic and thermosetting systems containing EG conductive fillers, such as polyurethane, novalac resin and epoxy as reported in the literature (see Table 2). 55–66 Figure 7.Experimental total EMI-SE of the polybenzoxazine/EG nanocomposites at various EG ratios.…”
Section: Resultsmentioning
confidence: 99%
“…Our newly explored nanocomposites showed higher EMI SE values, in the X-band (8.2-12.4 GHz), compared to serval thermoplastic and thermosetting systems containing EG conductive fillers, such as polyurethane, novalac resin and epoxy as reported in the literature (see Table 2). [55][56][57][58][59][60][61][62][63][64][65][66] Table 3 collects the experimental data on the total EMI SE average, SE A , and the SE R for the developed nanocomposites at various EG ratios. It is clearly appeared that, as the content of EG increased in these nanocomposites, both the SE A and SE R are increased, while the contribution of reflection mode is more dominant after the percolation threshold.…”
Section: Electrical Conductivity Of Polybenzoxazine/ Eg Nanocompositesmentioning
The thermal, the electrical conductivity, and electromagnetic shielding properties of low cost high-performance expanded graphite (EG)-filled polybenzoxazine matrix nanocomposites produced by a solution blending and compression molding technique were investigated. At 2.26 vol.% EG, a percolation threshold was detected, at which the electrical conductivity increased by nine orders of magnitude in comparison to the unfilled matrix. The electrical conductivity values increased from 1.35 S.cm−1 to 28.3 S.cm−1 by increasing the EG ratios in the nanocomposites from 7 wt.% and 15 wt.%. In addition, the morphological analysis results revealed good nanofiller dispersion and the formation of 3D-conductive pathways of EG into the polybenzoxazine matrix, which are responsible for the electrical conductivity improvement. Moreover, the electromagnetic interference (EMI) shielding efficiencies, in the X-band, of these nanocomposites have been significantly improved, reaching 57.2 dB at a 15 wt.% EG ratio. Furthermore, the inclusion of EG nanofiller significantly improved the thermal properties of the nanocomposites in terms of first degradation temperatures, char yields, and thermal conductivities. Because of these exceptional properties, these nanocomposites are ideal for high thermal EMI shielding applications.
“…24,25 Hydrogel-based shielding materials have garnered significant attention in academia and industry due to their unique properties, including hydrophilicity, high aspect ratio, and tunability. 26,27…”
Section: Introductionmentioning
confidence: 99%
“…24,25 Hydrogel-based shielding materials have garnered significant attention in academia and industry due to their unique properties, including hydrophilicity, high aspect ratio, and tunability. 26,27 Sodium alginate (SA) is a natural polysaccharide with excellent stability, biocompatibility, adhesion, and safety. 13,[28][29][30] Although SA itself has no ability to conduct electricity, it can bind to metal cations such as sodium and calcium.…”
Section: Introductionmentioning
confidence: 99%
“…34 Moreover, the large molecular chains of PVA and PEG can electrostatically attract and physically entangle with the SA molecular chains, further enhancing the mechanical capacity of the hydrogel. 22,27,28 SA, PVA and other materials will degrade naturally under specific circumstances of microorganisms. [30][31][32] This process will release carbon dioxide and water, hence avoiding environmental pollution.…”
This paper describes the preparation of an environmentally friendly and biodegradable hydrogel type electromagnetic shielding material by using common salt to induce the self-assembly of sodium alginate.
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