首页|多功能MXene-CCNT/聚酰亚胺电磁屏蔽薄膜的制备与性能

多功能MXene-CCNT/聚酰亚胺电磁屏蔽薄膜的制备与性能

Preparation and properties of multifunctional MXene-CCNT/polyimide electromagnetic shielding films

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导电聚合物复合材料(CPC)因其耐腐蚀性好、比强度高、成本低和易加工等良好的综合性能,被广泛用于制备电磁屏蔽材料.本文采用简单的刮膜法和热酰亚胺化法制备了综合性能良好的MXene-羧基化碳纳米管/聚酰亚胺(MXene-CCNT/PI)复合薄膜.MXene和CCNT协同作用构筑了良好的导电网络,赋予薄膜高效的电磁屏蔽效能(EMI SE),当MXene和CCNT含量均为 12.5wt%,膜厚度为 80 μm时,电导率和EMI SE分别为 5.88 S/cm和 26.49 dB,电磁屏蔽效能与厚度的比值(EMI SE/t)为 331.13 dB/mm.并且在极端恶劣环境下(酸-碱处理、高低温处理和重复弯曲)显示出持久而稳定的EMI SE.与此同时,MXene-CCNT/PI薄膜仍具有 53.17 MPa的拉伸强度、优异的热稳定性(＞500℃)和阻燃性能.实现了聚合物基电磁屏蔽复合材料的便捷、高效制备,同时兼顾其优异的力学性能和耐热性能.
Conductive polymer composites(CPCs)are widely used for the preparation of electromagnetic shielding materials due to their good comprehensive performance such as good corrosion resistance,high specific strength,low cost and easy processing.In this paper,MXene-carboxylated carbon nanotube/polyimide(MXene-CCNT/PI)composite films with good comprehensive performance were prepared by a simple scraping and thermal imidiza-tion method.The synergistic action of MXene and CCNT constructed a good conductive network,which gave the films high efficient electromagnetic shielding performance(EMI SE).When the contents of both MXene and CCNT were 12.5wt%,the film thickness was 80 μm,the conductivity was 5.88 S/cm,the EMI SE was 26.49 dB,and the ratio of electromagnetic shielding effectiveness to thickness(EMI SE/t)was 331.13 dB/mm.Moreover,the film showed long-lasting and stable EMI SE under extreme environments(acid-alkali treatment,high and low temperature treat-ment,and repetitive bending).At the same time,the MXene-CCNT/PI film still have a tensile strength of 53.17 MPa,excellent thermal stability(＞500℃),and flame retardancy.Convenient and efficient preparation of polymer-based EMI shielding composites is realized,taking into account their excellent mechanical properties and heat resistance.

polyimideMXenecarboxylated carbon nanotubeelectromagnetic interference shieldingfilm

储娜、骆春佳、晁敏、杨雪雪、颜录科

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长安大学 材料科学与工程学院,西安 710018

聚酰亚胺 MXene 羧基化碳纳米管 电磁屏蔽 薄膜

国家自然科学基金陕西省重点研发计划陕西省创新能力支撑计划长安大学中央高校基本科研业务费专项长安大学中央高校基本科研业务费专项

220050392022GY-4032023-CX-TD-43300102312403300102313208

2024

10.13801/j.cnki.fhclxb.20231214.002

复合材料学报
北京航空航天大学 中国复合材料学会

复合材料学报

CSTPCD北大核心
影响因子：0.933
ISSN：1000-3851
年,卷(期)：2024.41(8)