Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

Abstract

The utilization of eco-friendly, lightweight, high-efficiency and high-absorbing electromagnetic interference (EMI) shielding composites is imperative in light of the worldwide promotion of sustainable manufacturing. In this work, magnetic poly (butyleneadipate-co-terephthalate) (PBAT) microspheres were firstly synthesized via phase separation method, then PBAT composite foams with layered structure was constructed through the supercritical carbon dioxide foaming and scraping techniques. The merits of integrating ferroferric oxide-loaded multi-walled carbon nanotubes (Fe3O4@MWCNTs) nanoparticles, a microcellular framework, and a highly conductive silver layer have been judiciously orchestrated within this distinctive layered configuration. Microwaves are consumed throughout the process of “absorption-reflection-reabsorption” as much as possible, which greatly declines the secondary radiation pollution. The biodegradable PBAT composite foams achieved an EMI shielding effectiveness of up to 68 dB and an absorptivity of 77%, and authenticated favorable stabilization after the tape adhesion experiment.

Stable and Transparent Ca2+-Cross-Linked Alginate Composite Films for EMI Shielding and Joule Heating

“…As expected, all the CA/AgNWs/CA composite films present a strong EMI shielding ability in the X band, and their EMI shielding effectiveness increases from 14.9 to 27.9 dB with an increasing AgNW area density (0.11–0.56 mg cm –2 ) (Figure b,c). The shielding effectiveness of reflection (SE R )­and absorption (SE A ) are shown in Figure c to explain the EMI shielding mechanism of the transparent CA/AgNWs/CA composite film, and their corresponding coefficient ( A and R ) are calculated to analyze the dissipation of EMWs. − When the incident EMW strikes the CA/AgNWs/CA composite film, most EMWs are reflected immediately due to the conductive loss of the continuous AgNW network. The dissipated EMWs are converted to heat or other energy constantly (Figure d). ,− Notably, the more intensive AgNWs network resulted in more intense dissipation of EM waves, and the portion of reflection increased from 62 to 88%.…”

Embedded 3D printing of RGO frameworks with mechanical strength, and electrical and electromagnetic interference shielding properties

“…Conductive polymer composites have been widely used in the field of electromagnetic protection due to their advantages of lightweight, chemical stability, and easy processing. 55 Compared with magnetic conductive fillers (CoNi, 56 Fe 3 O 4 , 57,58 Fe 3 O 4 @MWCNTs/Ni, 59 Fe 3 O 4 @MWCNTs, 60 etc. ), the RGO framework has rich conductive networks and designed macrostructure to enhance shielding performance.…”

Robust MXene Nanosheet-Based Electromagnetic Interference Shielding Membrane with Cation–π Interactions

“…Consequently, an immediate and pressing need has emerged to discover a new breed of EMI shielding materials that exhibit flexibility and ease of processing. Such materials hold the potential to revolutionize the field, ensuring effective and efficient shielding against EMI while simultaneously circumventing the limitations associated with conventional metal-based approaches. − …”