Heterogeneous silicon rubber composite foam with gradient porous structure for highly absorbed ultra-efficient electromagnetic interference shielding

Yang, Jianming; Liao, Xia; Gui, Wang; Chen, Jia; Song, Pengwei; Tang, Wenchao; Guo, Fengjiao; Liu, Feng; Li, Guangxian

doi:10.1016/j.compscitech.2021.108663

Cited by 91 publications

(32 citation statements)

References 55 publications

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“…Many single or hybrid fillers with different functions (thermal, electrical, magnetic [ 8 – 10 ]) have been added into polymer matrix by molding press, filtration, blade coating, etc . [ 11 – 13 ], to fabricate polymer-based composite films with enhanced thermal conduction and EMI shielding performances [ 14 – 18 ]. Wei et al .…”

Section: Introductionmentioning

confidence: 99%

“…Many single or hybrid fillers with different functions (thermal, electrical, magnetic [8][9][10]) have been added into polymer matrix by molding press, filtration, blade coating, etc. [11][12][13], to fabricate polymer-based composite films with enhanced thermal conduction and EMI shielding performances [14][15][16][17][18]. Wei et al prepared multi-walled carbon nanotube/water-based polyurethane (MWCNT/WPU) composite films by in situ polymerization and blade coating method.…”

Section: Introductionmentioning

confidence: 99%

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Hierarchically Multifunctional Polyimide Composite Films with Strongly Enhanced Thermal Conductivity

et al. 2021

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The development of lightweight and integration for electronics requires flexible films with high thermal conductivity and electromagnetic interference (EMI) shielding to overcome heat accumulation and electromagnetic radiation pollution. Herein, the hierarchical design and assembly strategy was adopted to fabricate hierarchically multifunctional polyimide composite films, with graphene oxide/expanded graphite (GO/EG) as the top thermally conductive and EMI shielding layer, Fe3O4/polyimide (Fe3O4/PI) as the middle EMI shielding enhancement layer and electrospun PI fibers as the substrate layer for mechanical improvement. PI composite films with 61.0 wt% of GO/EG and 23.8 wt% of Fe3O4/PI exhibits high in-plane thermal conductivity coefficient (95.40 W (m K)−1), excellent EMI shielding effectiveness (34.0 dB), good tensile strength (93.6 MPa) and fast electric-heating response (5 s). The test in the central processing unit verifies PI composite films present broad application prospects in electronics fields.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hierarchically Multifunctional Polyimide Composite Films with Strongly Enhanced Thermal Conductivity

et al. 2021

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“…The transmittance ( T ), reflectance ( R ), and absorbance ( A ) coefficients were obtained by S parameters, which can be calculated as T=|S12|2=|S21|2, R=|S11|2=|S22|2, and A=1−T−R. The SE T by reflection loss (SE R ) or absorption loss (SE A ) was calculated by following equations 13,45 :…”

Section: Resultsmentioning

confidence: 99%

“…In order to investigate the contribution of absorption and reflection to the total EMI SE, S parameters were used for the measurement. The transmittance (T), reflectance (R), and absorbance (A) coefficients were obtained by S parameters, which can be calculated as T ¼ jS 12 j 2 ¼ jS 21 j 2 , R ¼ jS 11 j 2 ¼ jS 22 j 2 , and A ¼ 1 À T À R. The SE T by reflection loss (SE R ) or absorption loss (SE A ) was calculated by following equations 13,45 :…”

Section: Electromagnetic Interference Shieding Properties Of Multisca...mentioning

confidence: 99%

Light-weight carbon fiber/silver-coated hollow glass spheres/epoxy composites as highly effective electromagnetic interference shielding material

Chen

Qin

et al. 2021

Journal of Reinforced Plastics and Composites

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Highly effective electromagnetic interference shielding materials with light-weight feature are urgently demanded for releasing electromagnetic pollution. In this study, the hollow glass spheres were coated with silver particles to produce electrically conductive microspheres. The Carbon fiber/silver-coated hollow glass spheres (Ag@HGMs)/epoxy composites were manufactured by composites liquid molding process. The electromagnetic interference shielding properties of the composites were investigated in the X-band (8.2–12.4 GHz) range. The Ag@HGMs play a role in filling up the vacancy of the conductive network of carbon fibers in the composites, which not only form new conductive pathways but also act as bridges to connect CFs and provide additional channels for the electron transfer within the composites thus improving the electrical conductivity. The total shielding effectiveness (SET) increases with increasing Ag@HGMs loadings and the maximum SET is high as 88.1 dB. The increased SET dominated by absorption loss SEA is attributed to the high conductivity and multilayer construction of carbon fiber veil. The maximum specific SE of the carbon fiber/Ag@HGMs/epoxy composites can achieve 128.8 dB cm3/g, simultaneously the tensile strength and modulus can reach 95.6 MPa and 2.71 GPa, which provides a facile and promising strategy for designing and developing light-weight and high performance electromagnetic interference shielding materials.

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“…Such gradient structures can achieve both low reflectivity and high EMI SE by combining (i) the absorption layer, with excellent impedance matching and high attenuation capability, and (ii) the reflection layer with superior electrical conductivity and high reflection capability. A waterborne polyurethane/FeCo@rGO/Ag-coated expanded polymer bead (EBAg) composite foam exhibited an average EMI SE of 84 dB with an average SE R of 0.32 dB [ 46 , 47 ]. Despite the importance of shielding materials with ultralow reflection, the field is at an early stage, and there are very few research works devoted to the manufacture of efficient ultralow reflection shielding materials.…”

Section: Introductionmentioning

confidence: 99%

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

et al. 2021

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Lightweight, high-efficiency and low reflection electromagnetic interference (EMI) shielding polymer composites are greatly desired for addressing the challenge of ever-increasing electromagnetic pollution. Lightweight layered foam/film PVDF nanocomposites with efficient EMI shielding effectiveness and ultralow reflection power were fabricated by physical foaming. The unique layered foam/film structure was composed of PVDF/SiCnw/MXene (Ti3C2Tx) composite foam as absorption layer and highly conductive PVDF/MWCNT/GnPs composite film as a reflection layer. The foam layer with numerous heterogeneous interfaces developed between the SiC nanowires (SiCnw) and 2D MXene nanosheets imparted superior EM wave attenuation capability. Furthermore, the microcellular structure effectively tuned the impedance matching and prolonged the wave propagating path by internal scattering and multiple reflections. Meanwhile, the highly conductive PVDF/MWCNT/GnPs composite (~ 220 S m−1) exhibited superior reflectivity (R) of 0.95. The tailored structure in the layered foam/film PVDF nanocomposite exhibited an EMI SE of 32.6 dB and a low reflection bandwidth of 4 GHz (R < 0.1) over the Ku-band (12.4 − 18.0 GHz) at a thickness of 1.95 mm. A peak SER of 3.1 × 10–4 dB was obtained which corresponds to only 0.0022% reflection efficiency. In consequence, this study introduces a feasible approach to develop lightweight, high-efficiency EMI shielding materials with ultralow reflection for emerging applications.

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Heterogeneous silicon rubber composite foam with gradient porous structure for highly absorbed ultra-efficient electromagnetic interference shielding

Cited by 91 publications

References 55 publications

Hierarchically Multifunctional Polyimide Composite Films with Strongly Enhanced Thermal Conductivity

Hierarchically Multifunctional Polyimide Composite Films with Strongly Enhanced Thermal Conductivity

Light-weight carbon fiber/silver-coated hollow glass spheres/epoxy composites as highly effective electromagnetic interference shielding material

Layered Foam/Film Polymer Nanocomposites with Highly Efficient EMI Shielding Properties and Ultralow Reflection

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