Electromagnetic Shielding Performance of CF/EP Composites with Sandwiched Structure

Qiuwen Li; Wei Li

doi:10.54097/4dwj2z42

Authors

Qiuwen Li
Wei Li

DOI:

https://doi.org/10.54097/4dwj2z42

Keywords:

Carbon fiber composites, conductive film, electromagnetic shielding performance, carbon nanotube, PEK-C

Abstract

Carbon fiber reinforced polymer matrix composites are widely used in many fields due to their excellent mechanical properties. Moreover, the carbon fiber composites can also be used as electromagnetic shielding materials because carbon fibers have good electrical conductivity. However, the formation of effective conductive network in the unidirectional composites is restricted because each carbon fiber is surrounded by the resin and separated from each other. As a result, the electromagnetic shielding performance of the unidirectional carbon fiber composite is not satisfied. In this paper, the single walled carbon nanotube (SWCNT)/PEK-C films with good electrical conductivity were prepared by using the coating method. The conductive films were then placed between layers of unidirectional carbon fiber prepreg to obtain the composites with sandwich structure by the compression molding technology. The results showed that the electromagnetic shielding effectiveness of the composites sandwiched with the films was significantly improved compared with the neat unidirectional composite. The absorption-dominated shielding mechanism of the composites was also proved. Meanwhile, the composites also exhibited good mechanical properties.

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