Effective attenuation of electromagnetic waves by Ag adorned MWCNT-polybenzoxazine composites for EMI shielding application

Rengaswamy, Kumaran; Asapu, Vinaya Kumar; Ramaprabhu, Sundara; Subramanian, V.

doi:10.1016/j.compscitech.2022.109411

Cited by 18 publications

(10 citation statements)

References 37 publications

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“…The ratio of A/R is lower than 1, demonstrating that a majority of incident EM waves were reflected at the interfaces. The remaining small part of EW then entered into the Ag/LSW network and eventually attenuated by electromagnetic energy conversion which is in accordance with metallic hybrid network such as Ag nanowire/ graphene 51 (84.01 dB) and Ag/multiwall carbon nanotube 52 (81 dB) skeleton. Considering the consumption of EM energy, the dissipation of the EM waves follows a reflection-dominant shielding mechanism.…”

Section: Se Se Sementioning

confidence: 82%

Multifunctional Silver Decorated Leather Solid Waste/Poly(Vinyl Alcohol) Nanocomposites for Electromagnetic Interference Shielding, Joule Heating and Crude-Oil cleaning

Shi

Jiang

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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With the rapid development of modern intelligent industry and the Internet of Things, the demand for multifunctional electromagnetic interference (EMI) shielding material has increased for complicated application scenes. Herein, derived from a hazardous waste, i.e., leather solid waste (LSW), a silver/LSW/poly(vinyl alcohol) (PVA) membrane has been prepared via resourceful combination of solids state shear milling (S3 M) and electroless plating technology. The debundled leather fibers prepared by S3 M can act as template for silver electroless plating and thus conductive Ag/LSW fibers with high aspect ratio and electrically conductive were achieved. Moreover, Ag/LSW fibers were integrated into film and sealed with PVA to form the Ag/LSW/PVA membrane. Owing to the high conductivity and mechanical performance of PVA, the Ag/LSW/PVA membrane (1.2 mm) exhibited EMI shielding (62 dB), mechanical robustness (tensile strength reached to 89.7 MPa), and Joule heating capability (56 s to 101.3 °C). Impressively, the multifunctional membrane exhibits great potential in future smart oil stations, where under the premise of satisfying high-efficiency electromagnetic shielding, the Ag/LSW/PVA membrane can effectively absorb heavy crude oil through the Joule heating and porous structure and achieve double protection for electronic devices.

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Section: Se Se Sementioning

confidence: 82%

Multifunctional Silver Decorated Leather Solid Waste/Poly(Vinyl Alcohol) Nanocomposites for Electromagnetic Interference Shielding, Joule Heating and Crude-Oil cleaning

Shi

Jiang

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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“…Traditional metals could usually be divided into electric and magnetic shielding materials 73–75 . Currently, metals with high ECs (such as Cu, Al, Ag, and Au) and magnetic permeabilities (such as Fe, Co, and Ni) were mainly selected as the EMI shielding materials 76 .…”

Section: Research Progress Of Emi Shielding Materialsmentioning

confidence: 99%

“…Traditional metals could usually be divided into electric and magnetic shielding materials. [73][74][75] Currently, metals with high ECs (such as Cu, Al, Ag, and Au) and magnetic permeabilities (such as Fe, Co, and Ni) were mainly selected as the EMI shielding materials. 76 The shielding mechanisms have indicated that the metals and their metal alloys performed high EMI SEs because of their superior ECs and high reflection ability of EMWs.…”

Section: Metal Materials and Their Nanofillersmentioning

confidence: 99%

Recent advances in structural design of conductive polymer composites for electromagnetic interference shielding

Zheng,

Wang,

Zhu

et al. 2023

Polymer Composites

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The proliferation of electronic devices and wireless communication in our daily lives has led to a significant increase in electromagnetic pollution. This issue poses a serious threat to the proper functioning of electronic equipment as well as human health. Therefore, the investigation of materials with superior electromagnetic interference (EMI) shielding capabilities has garnered growing interest. In this paper, the mechanisms of EMI shielding were first introduced briefly. It was noted that the development of advanced EMI shielding materials involved adhering to principles such as minimizing reflection loss, enhancing absorption loss, and incorporating multiple internal reflections. The construction and shielding properties of traditional EMI shielding materials were introduced. Unlike metal materials with high densities and reflection loss, lightweight conductive polymer composites (CPCs) have been the most promising EMI shielding materials. Meanwhile, carbon‐based nanofillers such as carbon nanotubes and graphene nanosheets, along with two‐dimensional transition metal carbonitrides MXenes Ti3C2Tx, have emerged as the most promising and versatile conductive nanofillers for CPCs. The EMI shielding performance and loss mechanism of CPCs with homogeneous structure, segregated structure, laminated structure, and porous structure were introduced in detail. It was noted that the EMI shielding performance could be significantly improved by incorporating multiple structures into the same CPCs, such as a rational combination of segregated and porous structures. Finally, the challenges and development trends of CPCs for EMI shielding applications were discussed.Highlights Mechanisms of EMI shielding were introduced from aspect of energy dissipation. Structure–property of traditional EMI shielding materials was described. EMI shielding performance of CPCs with different structures was summarized. Future challenges and growing trends of CPCs for EMI shielding were discussed. Absorption‐dominated loss and multiple structure design were emphasized.

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“…These advantages have attracted the attention of researchers. The molecular structure design of PBZ is very flexible, and various structures of polybenzoxazines have been developed for a wide range of applications, including polymer coatings [ 5 , 6 , 7 ], flame retardants [ 8 , 9 , 10 ], electromagnetic shielding [ 11 , 12 ], and microelectronics [ 1 , 13 , 14 , 15 ]. Nevertheless, PBZ thermosets also have some drawbacks that limit its application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Novel Bifunctional Epoxy Double-Decker Silsesquioxane: Improvement of the Thermal Stability and Dielectric Properties of Polybenzoxazine

Sun

Wang

et al. 2022

Polymers

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In this study a new type of bifunctional epoxy compound (DDSQ-EP) based on double-decker silsesquioxane (DDSQ) was synthesized by process of alkaline hydrolysis condensation of phenyltrimethoxysilane and corner capping reaction with dichloromethylvinylsilane, followed by epoxidation reaction of vinyl groups. The resultant structures were confirmed using Fourier transform infrared spectrometry, nuclear magnetic resonance spectrometry and time-of-flight mass spectrometry, respectively. The DDSQ-EP was incorporated into polybenzoxazine to obtain the PBZ/DDSQ-EP nanocomposites. The uniform dispersion of DDSQ-EP in the nanocomposites was verified by X-ray diffraction and scanning electron microscope. The reactions occurred during the curing of the composites and were investigated using infrared spectroscopy of segmented cures. Dynamic mechanical analysis and thermal gravimetric analysis indicated that the storage modulus, glass transition temperature and thermal stability of PBZ/DDSQ-EP were increased in comparison with pure benzoxazine resins. Assessment of dielectric properties demonstrated that the dielectric permittivity and dielectric loss of polybenzoxazine decreased slightly because of the addition of DDSQ-EP.

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Effective attenuation of electromagnetic waves by Ag adorned MWCNT-polybenzoxazine composites for EMI shielding application

Cited by 18 publications

References 37 publications

Multifunctional Silver Decorated Leather Solid Waste/Poly(Vinyl Alcohol) Nanocomposites for Electromagnetic Interference Shielding, Joule Heating and Crude-Oil cleaning

Multifunctional Silver Decorated Leather Solid Waste/Poly(Vinyl Alcohol) Nanocomposites for Electromagnetic Interference Shielding, Joule Heating and Crude-Oil cleaning

Recent advances in structural design of conductive polymer composites for electromagnetic interference shielding

Synthesis of a Novel Bifunctional Epoxy Double-Decker Silsesquioxane: Improvement of the Thermal Stability and Dielectric Properties of Polybenzoxazine

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