Improvement of the electromagnetic shielding properties of C/SiC composites by electrophoretic deposition of carbon nanotube on carbon fibers

Hui, Mei; Han, Daoyang; Xiao, Shanshan; Ji, Tianming; Tang, Jian; Cheng, Laifei

doi:10.1016/j.carbon.2016.07.070

Cited by 113 publications

(24 citation statements)

References 28 publications

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“…Carbon nanotubes (CNTs) with unique electrical, mechanical, and thermal properties have exhibited great value in designing electrical conductive composites, electromagnetic interference shielding, and energy harvesting materials . These excellent properties of CNTs also make them ideal fillers to design polymer foams for some important reasons.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…In modern society, electromagnetic compatibility requirement has become necessary for the electronic devices and wireless communication devices to meet the high‐reliable demand in the commercial, scientific and military use . For electromagnetic interference (EMI) shielding application, electrically conductive polymer composites (CPCs) are more attractive than the conventional metal‐based shielding materials due to their unique combination of light weight, good corrosion resistance, good processability, low cost, and flexible electrical conductivity .…”

Section: Introductionmentioning

confidence: 99%

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Zhao

Wang

2018

Polymer Composites

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Nanocomposites of polymethyl methacrylate/multi‐walled carbon nanotubes (MWCNTs) were prepared via four different methods, namely, melt blending cum injection molding (MI), melt blending cum compression molding (MC), solution blending cum compression molding (SC), and solution blending cum melt compounding (SM). The effects of preparation methods on the microstructure, mechanical and electrical properties, and electromagnetic interference (EMI) shielding performance were investigated. The solution‐based methods can disperse MWCNTs more uniformly without any significant agglomerates than the melt‐based methods. The injection molding method led to significant alignment of MWCNTs, while the compression molding method allowed MWCNTs randomly distributed. Because of the uniform dispersion of MWCNTs, the SM nanocomposite exhibited the lowest percolation threshold (0.25 vol%), and the highest modulus and electrical conductivity among all the samples. Under a MWCNT concentration of 1.72 vol%, the SM nanocomposite showed a shielding effectiveness up to 68 dB. The MI and MC nanocomposite showed poor mechanical and electrical properties due to severe agglomerates and breakages of MWCNTs. The EMI shielding mechanism of the nanocomposites prepared by different methods was discussed by coupling the distribution, dispersion and microstructure of MWCNTs, and shielding theory. The findings are important for guiding the design and fabrication of high‐efficient conductive polymer nanocomposites. POLYM. COMPOS., 40:E1786–E1800, 2019. © 2018 Society of Plastics Engineers

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“…Recently, much of SiC‐matrix composites have demonstrated great potential as EM interference (EMI) shielding and EM wave absorption materials. Such materials include SiC/Si 3 N 4, C f /CNT/SiC, CNT/SiC, CNT/SiC f fabrics, C f /SiC, C/SiC, yttria‐stabilized zirconia (YSZ)/SiC, SiC f /SiC, SiC foams, SiC/SiO 2, SiC‐based ceramic woven fabrics, SiC/Si 3 N 4, SiC/SiOC, and Si 3 N 4 –SiC/SiO 2. SiC matrix is usually fabricated by chemical vapor infiltration (CVI), compared to other ceramic processing methods, the CVI method possesses several significant advantages such as near‐net final shapes, minimizing mechanical damage of the fibers due to lower pressure and temperature requirements, the latter in the range of 900°C‐1100°C, low mechanical stress, and higher purity of the resultant matrices.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic shielding properties of carbon‐rich chemical vapor infiltration‐prone silicon carbide matrix composites

et al. 2017

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This study focuses on the electromagnetic interference shielding effectiveness (EMI SE) of SiC nanowire/SiC ceramic composites (SiC nw /SiC) manufactured by chemical vapor infiltration of SiC nw aerogels with carbon-rich SiC. The total EMI SE of a 1.0 mm thick ceramic composite specimen with density of only 2.68 g/ cm 3 , was found to be 43-44 dB, which indicates an excellent EM shielding capability of the ceramic composite corresponding to blocking of 99.99% of the incident EM signal. It was found that the carbon-rich CVI-SiC matrix possess excellent EM shielding properties, therefore, the CVI-SiC CMCs themselves possess an excellent EM shielding property as a result of the carbon-rich SiC matrix.aerogel, carbon, chemical vapor infiltration, electromagnetic properties, silicon carbide

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Improvement of the electromagnetic shielding properties of C/SiC composites by electrophoretic deposition of carbon nanotube on carbon fibers

Cited by 113 publications

References 28 publications

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

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

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Electromagnetic shielding properties of carbon‐rich chemical vapor infiltration‐prone silicon carbide matrix composites

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Improvement of the electromagnetic shielding properties of C/SiC composites by electrophoretic deposition of carbon nanotube on carbon fibers

Cited by 113 publications

References 28 publications

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

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

Effect of preparation methods on electrical and electromagnetic interference shielding properties of PMMA/MWCNT nanocomposites

Electromagnetic shielding properties of carbon‐rich chemical vapor infiltration‐prone silicon carbide matrix composites

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

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