为获得轻薄柔性、高安全性、适用范围更广的电磁屏蔽复合膜,采用聚间苯二甲酰间苯二胺(PMIA)纺丝液制备静电纺丝膜,在膜两侧喷涂银纳米线(AgNWs)构建夹层结构导电层,形成了具有反射-透过-再反射的协同电磁损耗机制。系统表征了PMIA/AgNWs复合膜的形貌与结构,探究了不同AgNWs喷涂量对复合膜电磁屏蔽性能的影响规律。结果表明:复合膜的电磁屏蔽性能随AgNWs喷涂量的增大而提升,最大喷涂量下的屏蔽效能高达63.1dB。PMIA膜优异的耐温阻燃性能和柔韧性,使复合膜在200℃环境下连续使用200h及2000次弯折后,电磁屏蔽性能仍保持高水平,适用于轻薄柔性的电子器件或织物的电磁防护功能层中。
In order to obtain an electromagnetic shielding composite membrane with lightweight,flexibility,high safety,and a wider application range,an electrospinning membrane was prepared using Meta-aramid (PMIA) spinning solution.Silver nanowires (AgNWs) were sprayed on both sides of the membrane to form a sandwich structure conductive layer,resulting in a synergistic electromagnetic loss mechanism of reflection,transmission,and re-reflection.The morphology and structure of the PMIA/AgNWs composite membrane were systematically characterized,and the influence of different AgNWs spraying contents on the electromagnetic shielding performance of the composite membrane was investigated.The results showed that the electromagnetic shielding performance of the composite membrane increased with the increase in AgNWs spraying content,and the shielding efficiency at the maximum spraying content reached up to 63.1dB.The excellent temperature resistance and flame retardancy of the PMIA membrane,as well as its flexibility,enabled the composite membrane to maintain a high level of electromagnetic shielding performance even after continuous treatment at 200℃ for 200h and 2000 bending cycles,making it suitable for the electromagnetic protection functional layer of thin and flexible electronic devices or fabrics.
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基金资助
江苏省重点研发计划项目(BE2022140)
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