Processing and Characteristics of Polytetrafluoroethylene Based Electromagnetic Shielding Composite Films

doi:10.12382/bgxb.2022.0594

Abstract

Abstract: Polytetrafluoroethylene (PTFE) based composite films with high electrical conductivity, great deformability and high electromagnetic shielding property were prepared using liquid metal (EGaIn@Ag), silver flakes and multi-wall carbon nanotubes as hybrid conductive fillers. The mechanical, electrical and electromagnetic shielding properties of the composite films were investigated comprehensively. The results showed that the composite films possess great mechanical properties with the elongation at break of more than 250% and the tensile strength of 18.1 MPa, and the square resistance of the composite film can be as low as 5.34 Ω/sq. With the addition of EGaIn@Ag, the change rate of resistance can be effectively reduced during tensile deformation. The electromagnetic shielding efficiency (EMI SE) of the PTFE based composite film can reach up to 60.5 dB. At 10% tensile strain, the EMI SE of the composite film with the same amount of Ag and EGaIn@Ag was still 41.6 dB, while the EMI SE of the composite film with only silver sheet added was 26.8 dB. These demonstrate that the composite film with EGaIn@Ag has good EMI shielding performance even at a large deformation, possessing good application prospects.

Key words: polytetrafluoroethylene, compositefilms, liquidmetal, mechanicalproperty, electromagneticshielding

CLC Number:

TB332

JIA Rufeng, YIN Baolin, ZHANG Gaohong, PANG Xinchang, LIU Minying, YANG Guofang, LI Hao, L Qianli. Processing and Characteristics of Polytetrafluoroethylene Based Electromagnetic Shielding Composite Films[J]. Acta Armamentarii, 2022, 43(11): 2916-2923.

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