Review on Shielding Mechanism and Structural Design of Electromagnetic Interference Shielding Composites

Abstract

Conductive polymer composites (CPCs) for electromagnetic interference shielding have received significant attention and shown rapid development. According to the electromagnetic wave interface conduction theory of Schelkunoff, excellent conductive performance and perfect conductive network structure are prerequisites for high shielding efficiency of electromagnetic interference shielding composites. Effective multiple interface reflection absorption, dielectric loss, and hysteresis loss characteristics of the materials are crucial for realizing the regulation of the electromagnetic interference shielding performance of CPCs. Therefore, the structural design of conductive and magnetic network for CPCs is crucial for achieving high shielding performance. In this study, it is established that an electromagnetic shielding composite with a uniform structure is widely used because of its simple preparation process, but its inefficient conductive network causes a high percolation threshold. The inefficiency can be solved by designing a composite structure and improving the efficiency of the conductive network. Currently, common structural designs include segregated structural, layered structural, and foam structural designs. These structural designs effectively solve the problem of high percolation threshold of CPCs and coordinate the contradiction between the performance of electromagnetic interference shielding and other advantages.

Recent advancements in the electromagnetic interference shielding performance of nanostructured materials and their nanocomposites: a review

“…Studies were conducted on several nanomaterials, such as ferromagnetic element nanoalloys, metal oxides, ferrites and their polymers and ICP-based nanocomposites in EMI shielding applications. 276–405 The choice of magnetic materials-filled ICP nanocomposites in EMI shielding applications is mainly guided by the dielectric loss, magnetic loss and impedance matching of the component(s) of the material(s) under investigation. It provides a combination of magnetic nanoparticles and ICPs that account for its additionally reduced weight, cost, enhanced flexibility and corrosion resistance, tuneability conductivity and tailorable permeability.…”

Rapid Carbon Dioxide Foaming of 3D Printed Thermoplastic Polyurethane Elastomers

“…In the early stages, CO 2 -blown cellular foams were produced by batch foaming and were primarily used in research and development . Later, semicontinuous and continuous processing techniques like microcellular injection and extrusion methods were developed to make lightweight foam components with multimaterials for mass production in industries for commercial applications like sofa cushions. , Eventually, the application of these polymeric foam is extended to the field of scaffold manufacturing, sensor, and electromagnetic shielding (EMI) …”

“…8,9 Eventually, the application of these polymeric foam is extended to the field of scaffold manufacturing, sensor, and electromagnetic shielding (EMI). 10 Additive manufacturing can create prototypes and end products by developing new materials or improving the existing ones. 11 This technology has allowed the production of polymeric foam with hierarchical cellular structures by direct printing or assisted with other techniques.…”

Ultrathin and Mechanically Robust Mussel Byssus‐Inspired MXene@Aramid Nanofibers Materials with Superior Endurance in Harsh Environments for Tunable EMI Shielding Performance

“…Recently, lots of researches have suggested that constructed structure of the EMI shielding materials (e.g., nacred, segregated, and porous structures) play an essential factor on their EM pollution shielding capacity. [17][18][19] However, there are still rare reports to compare the EMI shielding capability with different structure. In particular, nacred structure has been proven to be highly efficient to combine the exceeding advantages from each individual material.…”