Preparation and Characterization of PU/PET Matrix Gradient Composites with Microwave-Absorbing Function

Gu, Wenyan; Zhan, Rong; Li, Rui; Liu, Jiaxin; Zhang, Jiaqiao

doi:10.3390/coatings11080982

Cited by 12 publications

(8 citation statements)

References 25 publications

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Section: Macro/microstructure Of Cnt‐based Microwave‐absorbing Materialsmentioning

confidence: 99%

“…CNT, Fe 3 O 4 compounded with polyurethane (PU), [138] polydimethylsiloxane, [139] etc., can the mechanical properties of the material be improved at the same time as the absorbing properties of the material. Gao et al [140] prepared Fe 3 O 4 /CNTs@Fe 3 O 4 /CNTs@G nanosheets (GN)@Fe 3 O 4 magnetic nanoparticles by a simple solvothermal method and dispersed them in a single component wet self-foaming polyurethane.…”

Section: D Layered Materialsmentioning

confidence: 99%

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Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

Cai,

Yu,

Cheng

et al. 2023

Advanced Sustainable Systems

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Electromagnetic (EM) contamination has now become a non‐negligible problem. To solve the EM contamination problem, it is imperative to develop high‐efficiency absorption materials with thin thickness, light weight, strong absorption properties, and broad absorption bands. Carbon nanotubes (CNTs) have a special helical structure and chirality, which will lead to special EM effects and therefore can absorb EM microwaves through magnetic polarization attenuation such as hysteresis loss, domain wall resonance, and aftereffect loss. Moreover, they have the characteristics of light weight, good compatibility, wide absorption frequency band, and high electrical loss angle tangent. In this paper, the different structures of CNT microwave‐absorbing composites are reviewed and the effects of the composite structures on the microwave‐absorbing properties are systematically discussed. The methods and mechanisms of surface modification of CNT absorber composites and the effects of modification on the absorber properties are summarized in detail. The progress of two specific CNT microwave‐absorbing composites, namely flexible and high‐temperature microwave‐absorbing composites, is briefly described. The shortcomings and challenges in the application of CNT microwave‐absorbing composites are described and future research directions for CNT microwave‐absorbing composites are explored.

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Section: Macro/microstructure Of Cnt‐based Microwave‐absorbing Materialsmentioning

confidence: 99%

Section: D Layered Materialsmentioning

confidence: 99%

Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

Cai,

Yu,

Cheng

et al. 2023

Advanced Sustainable Systems

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“…The values of dielectric permittivity ε of such a layer are as close as possible to ε of the external environment at magnetic permeability μ = 1. The subsequent layer or layers are distinguished by higher values of ε and μ that increase as one approach to the reflective substrate [ 12 ]. The thickness of the outer input layer is usually greater than the thicknesses of subsequent layers.…”

Section: Radio-absorbing Materials and Technologies For Their Productionmentioning

confidence: 99%

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

et al. 2022

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Recently, designers of electronic equipment have paid special attention to the issue of electromagnetic compatibility (EMC) of devices with their own components and assemblies. This is due to the high sensitivity of semiconductor microcircuits to electromagnetic interference. This interference can be caused either by natural phenomena, such as lightning strikes, or by technical processes, such as transients in circuits during fast periodic or random switching. Either way, interference implies a sudden change in voltage or current in a circuit, which is undesirable, whether it propagates along a cable or is transmitted as an electromagnetic wave. The purpose of this article is to review the works devoted to the development, creation, and investigation of modern polymeric nanocomposite materials used for shielding electromagnetic radiation and their effective application for solving problems of electromagnetic compatibility. Additionally, the approach to design EMI shielding complex media with predetermined parameters based on investigation of various properties of possible components is shown. In the review, all polymer composites are classified according to the type of filler. The issues of the interaction of a polymer with conductive fillers, the influence of the concentration of fillers and their location inside the matrix, and the structure of the nanocomposite on the mechanisms of electromagnetic interaction are considered. Particular attention is paid to a new generation of nanocomposite materials with widely adjustable electrical and magnetic properties. A wide class of modern filled polymeric materials with dielectric and magneto-dielectric losses is considered. These materials make it possible to create effective absorbers of electromagnetic waves that provide a low level of reflection coefficient in the microwave range. The model mechanisms for shielding electromagnetic radiation are considered in the paper. A detailed review of the electro-physical properties of polymer nanocomposites is provided. Multilayer electrodynamic media containing combinations of layers of filled polymer composite materials with nanoparticles of different compositions and manufactured using a single technology will make it possible to create electrodynamic media and coatings with the required electro-physical characteristics of absorption, transmission, and reflection. Within the framework of the two-layer coating model, the difference in the effects of the interaction of electromagnetic radiation with conductive layers located on a dielectric and metal substrate is demonstrated. It is shown that in order to achieve optimal (maximum) values of reflection and absorption of electromagnetic radiation in the appropriate frequency range, it is necessary to fit the appropriate layer thicknesses, specific conductivity, and permittivity. Such approach allows designers to create new shielding materials that can effectively vary the shielding, absorbing, and matching characteristics of coatings over a wide frequency band. In general, it can be said that the development of innovative polymer composite materials for shielding electronic devices from electromagnetic interference and excessive electromagnetic background is still an important task. Its solution will ensure the safe and uninterrupted operation of modern digital electronics and can be used for other applications.

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“…The second role of the textile is to promote the absorption of the MWAM. 24,25 For example, carbon fiber, 26 glass fiber, 27 and metal and metal alloy fiber, such as Ni, 28 can consume the electronic or magnetic component of the MWAM. The functional fiber of textiles would prolong the pathway of the M.W.…”

Section: Introductionmentioning

confidence: 99%

A review of graphene-based broad bandwidth microwave absorbing textile-based composites in the low-frequency range

Aiqiong

Chen

et al. 2022

Journal of Industrial Textiles

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The range and strength of Electromagnetic Wave loss are increasing with the development of electronic technology in intellectualization and diversification. Extensive research is focused on high-frequency microwave absorbersbut rarely on low-frequency ones. However, the shield of low-frequency microwave interference is bulky and complicated. It is necessary to adopt new structural composites with lightweight, porous, or multi-layer magneto-dielectric synergistic to obtain lighter, thinner, broader bandwidth, and strong absorption absorbers in the low-frequency range. The porous and multi-layer textiles would extend the Microwave (M. W.) transmitting pathway. The prepared M. W. textile-based composites possess broad bandwidth and strong absorption in the low-frequency range when magneto-dielectric synergistic functional particles have embedded in the textiles. This paper reviewed the modified graphene-based absorbers (GBAs), the hybrids combined GBAs with the low-frequency magnetic loss absorbers (LFMLAs), and the textile-based composites added by the complex combined GBAs with LFMLAs (GBAs/LFMLAs). The prepared GBAs/LFMLAs textile-based composites are broad bandwidth, lightweight, small thickness, and strong absorption materials in the low-frequency range. The prepared GBAs/LFMLAs textile-based microwave absorbers (MWAs) may expand the application scope of MWAs and promote their economic benefit. The GBAs/LFMLAs textile-based composites may propose a new strategy of broad bandwidth MWAs in the low-frequency range.

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Preparation and Characterization of PU/PET Matrix Gradient Composites with Microwave-Absorbing Function

Cited by 12 publications

References 25 publications

Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

Structure Design, Surface Modification, and Application of CNT Microwave‐Absorbing Composites

Radio-Absorbing Materials Based on Polymer Composites and Their Application to Solving the Problems of Electromagnetic Compatibility

A review of graphene-based broad bandwidth microwave absorbing textile-based composites in the low-frequency range

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