A promising strategy for efficient electromagnetic interference shielding by designing a porous double-percolated structure in MWCNT/polymer-based composites

Jia, Chen; Liao, Xia; Li, Shaojie; Wang, Wei; Guo, Fengjiao; Li, Guangxian

doi:10.1016/j.compositesa.2020.106059

Cited by 62 publications

(23 citation statements)

References 64 publications

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“…Among their many applications, these materials are used in sensors, intelligent medical devices, energy harvesting, actuators, flexible electronics, robotics, static dissipation and electromagnetic interference (EMI) shielding. The interest in these composite materials stems from their advantages, namely the ability to achieve the electrical conductivity in a wide range, processability into products of complex shapes, as well as flexibility, lightweight, and corrosion resistance [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

“…Conductive nanocomposites are obtained by dispersing electrically conductive nanoparticles (particles with at least one of their dimensions ranging from 1 to 100 nm) within a matrix. The most used nanoparticles to obtain electrically conductive polymers are carbon black (CB) [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ], carbon nanotubes (CNTs) [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 24 , 25 , 26 , 27 , 28 ], and graphene [ 12 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Due to the advantages conductive thermoplastic composites present, significant research has been conducted towards achieving certain desired properties at low filler concentrations, primarily by reducing the percolation threshold (PT).…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Low Percolation Threshold Induced by Thermal Treatments in Co-Continuous Blend-Based PP/PS/MWCNTs Nanocomposites

et al. 2021

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The effect of the crystallization of polypropylene (PP) forming an immiscible polymer blend with polystyrene (PS) containing conductive multi-wall carbon nanotubes (MWCNTs) on its electrical conductivity and electrical percolation threshold (PT) was investigated in this work. PP/PS/MWCNTs composites with a co-continuous morphology and a concentration of MWCNTs ranging from 0 to 2 wt.% were obtained. The PT was greatly reduced by a two-step approach. First, a 50% reduction in the PT was achieved by using the effect of double percolation in the blend system compared to PP/MWCNTs. Second, with the additional thermal treatments, referred to as slow-cooling treatment (with the cooling rate 0.5 °C/min), and isothermal treatment (at 135 °C for 15 min), ultra-low PT values were achieved for the PP/PS/MWCNTs system. A 0.06 wt.% of MWCNTs was attained upon the use of the slow-cooling treatment and 0.08 wt.% of MWCNTs upon the isothermal treatment. This reduction is attributed to PP crystals’ volume exclusion, with no alteration in the blend morphology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultra-Low Percolation Threshold Induced by Thermal Treatments in Co-Continuous Blend-Based PP/PS/MWCNTs Nanocomposites

et al. 2021

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“…Recently, developing porous CPCs with excellent EMI shielding effectiveness is gaining attention due to their low density, improved material efficiency and high specific EMI shielding effectiveness (SE), which demonstrates potential application in the fields of aerospace and aeronautics, automobiles and electronics [23][24][25][26][27]. For example, Chen et al [28] prepared a porous dual-continuous double percolated polystyrene (PS)/polymethyl methacrylate (PMMA)/carbon nanotubes (CNT) composites by combining melt blending and supercritical carbon dioxide foaming process. It was found that the percolation threshold was reduced from 0.18 to 0.14 vol%, and the specific EMI SE was increased from 37.79 to 57.70 dB/(g/cm 3 ) when compared the foamed samples with their solid counterparts.…”

Section: -Bonded Carbonmentioning

confidence: 99%

Carbonization of Graphene-Doped Isocyanate-Based Polyimide Foams to Achieve Carbon Foams with Excellent Electromagnetic Interference Shielding Performance

et al. 2021

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Lightweight carbon foams with excellent electromagnetic interference (EMI) shielding performance were prepared by carbonization process, using isocyanate-based polyimide foams as carbon precursors. The influence of carbonization temperature and graphene-doping on the morphological, electrical and EMI shielding effectiveness (SE) of corresponding carbon foams was studied in detail. Results showed that the addition of graphene was beneficial to the improvement of electrical conductivity and EMI shielding performance of carbon foams. The electrical conductivity of carbon foams increased with the carbonization temperature which was related to the increase of graphitization degree. Collapse of foam cells was observed at higher carbonization temperatures, which was detrimental to the overall EMI SE. The optimal carbonization temperature was found at 1100 °C and the carbon foams obtained from 0.5 wt% graphene-doped foams exhibited a specific EMI SE of 2886 dB/(g/cm3), which shows potential applications in fields such as aerospace, aeronautics and electronics.

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“…The porous configuration in CPCs improves the impedance matching between air and shields by introducing a large volume of air 34–36 . Functional fillers are distributed along the porous walls, causing multiple interfacial reflections and internal scattering to electromagnetic waves 37, 38 .…”

Section: Introductionmentioning

confidence: 99%

Porous polyamide 6/carbon black composite as an effective electromagnetic interference shield

Cai

Wang

Duan

et al. 2021

Polymer International

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Porous conductive polymer composites (CPCs) with functional additives are potential lightweight electromagnetic interference (EMI) materials. In this study, porous polyamide 6/carbon black (PA6/CB) composite was fabricated by a facile solution foaming strategy. When the content of CB was up to 20 wt%, a conductive network of CB was formed. The EMI shielding effectiveness (SE) of the prepared composites increased with CB fraction in the porous CPCs. When the content of CB reached 50 wt%, the values of SE reached 33.7–37.3 dB in the X band. This composite showed an EMI special SE of 221.97 dB cm3 g−1. The average absorptivity (A) coefficients of EMI reached 82.4% when the CB fraction was increased to 30 wt%. CPCs having a high fraction of inorganic CB showed an advantage in the reduction of non‐biodegradable plastics usage. The porous PA6/CB composite is a promising EMI material with an absorption‐dominated mechanism in the engineering field. © 2021 Society of Industrial Chemistry.

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A promising strategy for efficient electromagnetic interference shielding by designing a porous double-percolated structure in MWCNT/polymer-based composites

Cited by 62 publications

References 64 publications

Ultra-Low Percolation Threshold Induced by Thermal Treatments in Co-Continuous Blend-Based PP/PS/MWCNTs Nanocomposites

Ultra-Low Percolation Threshold Induced by Thermal Treatments in Co-Continuous Blend-Based PP/PS/MWCNTs Nanocomposites

Carbonization of Graphene-Doped Isocyanate-Based Polyimide Foams to Achieve Carbon Foams with Excellent Electromagnetic Interference Shielding Performance

Porous polyamide 6/carbon black composite as an effective electromagnetic interference shield

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