聚四氟乙烯基电磁屏蔽复合膜的研制及特性研究

doi:10.12382/bgxb.2022.0594

摘要/Abstract

摘要： 以聚四氟乙烯为基体树脂，以表面镀银的液态金属（EGaIn@Ag）、银片和多壁碳纳米管为导电填料，制备了具有高导电性、可大变形、高电磁屏蔽的聚四氟乙烯基复合膜，研究了复合膜的力学性能、电性能、电磁屏蔽效能等。结果表明：复合膜具有良好的延展性和力学强度，断裂伸长率达到了250%以上，拉伸强度达到了18.1 MPa；复合膜的方阻低至5.34 Ω/sq，EGaIn@Ag能够有效地减小复合膜在拉伸变形时的相对方阻变化率；复合膜的电磁屏蔽效能（EMI SE）最高达到了60.5 dB，当拉伸应变为10%，比例为Ag∶EGaIn@Ag=1∶1的复合膜的EMI SE值仍有41.6 dB，而只添加了银片的复合膜在拉伸应变为10%时的EMI SE值为26.8 dB。以上结果表明添加有液态金属的复合膜在较大的拉伸变形时，仍具有良好的电磁屏蔽效能，具有良好的应用前景。

关键词: 聚四氟乙烯, 复合膜, 液态金属, 力学性能, 电磁屏蔽

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

中图分类号:

TB332

贾汝锋，尹保林，张高鸿，庞新厂，刘民英，杨国芳，李浩，吕千里. 聚四氟乙烯基电磁屏蔽复合膜的研制及特性研究[J]. 兵工学报, 2022, 43(11): 2916-2923.

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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