Structural Design Strategies of Polymer Matrix Composites for Electromagnetic Interference Shielding: A Review

Abstract

With the widespread application of electronic communication technology, the resulting electromagnetic radiation pollution has been significantly increased. Metal matrix electromagnetic interference (EMI) shielding materials have disadvantages such as high density, easy corrosion, difficult processing and high price, etc. Polymer matrix EMI shielding composites possess light weight, corrosion resistance and easy processing. However, the current polymer matrix composites present relatively low electrical conductivity and poor EMI shielding performance. This review firstly discusses the key concept, loss mechanism and test method of EMI shielding. Then the current development status of EMI shielding materials is summarized, and the research progress of polymer matrix EMI shielding composites with different structures is illustrated, especially for their preparation methods and evaluation. Finally, the corresponding key scientific and technical problems are proposed, and their development trend is also prospected. "Image missing"

High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures

“…When the incident electromagnetic wave reaches the surface of rGH@FeNi/epoxy EMI shielding composites, some incident electromagnetic waves are reflected on the surface of rGH@FeNi/epoxy composites due to the impedance mismatch between external space and composites, while the rest electromagnetic waves enter the interior of rGH@FeNi/epoxy composites. First of all, when electromagnetic waves pass through the honeycomb wall of rGH, the highly conductive rGH will generate induced current and cause ohmic losses of electromagnetic waves [ 22 , 52 ]. Secondly, the existence of the honeycomb conductive/magnetic structure lengthens the transmission path of electromagnetic waves in the composites, leading to the enhanced attenuation of electromagnetic waves by multiple reflection and scattering [ 53 ].…”

Microstructures and electromagnetic interference shielding effectiveness of ME21/Mg laminated materials by accumulative roll bonding

“…Shielding is to 'cut off' the transmission path from electromagnetic interference source to electronic equipment, to reduce the impact of interference source on equipment [24]. The EMI shielding mechanism diagram was shown in figure 13, which was better to understand the EMI shielding intuitively.…”

Integration of efficient microwave absorption and shielding in a multistage composite foam with progressive conductivity modular design

“…1–5 Up to this point, research has mainly focused on constructing efficient conductive networks to improve the conductivity of shielding materials to realize excellent electromagnetic interference shielding effectiveness (EMI SE). 6–8 At the same time, flexible, 9–11 lightweight 12–15 and ultrathin 1,16,17 electromagnetic shielding materials are prepared according to the application requirements. However, fabricating electromagnetic shielding materials by constructing a uniform and highly conductive network in a polymer matrix is not a perfect solution.…”