Frequency‐selective electromagnetic interference shielding carbon spacer yarn fabric/polyurethane foam composites

Polymer Composites(2022)

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Abstract
3D fabric-reinforced composites with electromagnetic interference (EMI) shielding performance are in urgent demand to deal with the electromagnetic (EM) pollution. In this work, carbon spacer fabrics/polyurethane foam (CSF/PUF) composites were prepared via in situ integration of PUF with fabrics. Their EMI shielding and frequency-selective performances were realized via designing 3D fabric. CSF/PUF possesses two types of Fabry-Perot cavities that generated incident EM waves' resonances according to the quarter-wavelength theory. The average total EMI shielding effectiveness (SET) of 3CSF/PUF was 69.6 dB in the X band. The maximum EMI SET of 3CSF/PUF was up to 83.2 dB in 9.7 GHz. The peaks of EMI SE move to the high-frequency region with the increase of carbon spacer yarns' density. Moreover, CSF acted as a reinforcement role and significantly improved the mechanical properties of PUF. The peak stress under compression, three-point bending and low-velocity impact increased by 4.2-, 5.6-, and 4.9-folds, respectively. CSF/PUF also exhibited good thermal insulation properties, maintaining a temperature difference of at least 19.5 degrees C across its thickness at 60 degrees C. The as-prepared spacing yarn carbon fabric-reinforced composite foams may raise an interest to explore multifunctional EMI materials via fabric structure design.
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Key words
carbon spacer yarn fabric,electromagnetic interference shielding,frequency-selective,Sandwich-structured composites
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