The polyimide (PI)/carbon nanotube (CNT) films including 3,3′,4,4′-biphenyl tetracarboxylic dianhydride (BPDA), p-phenylenediamine (p-PDA), and CNTs were prepared, which have prominent electromagnetic (EM) wave absorption performance. Experimental analyses of the mechanical properties, thermal stabilities, coefficient of thermal expansion (CTE), the glass transition temperature (T_g), and EM parameter revealed the beneficial effects of the CNTs on the resulting composite films. In particular, when the content of CNTs is 6 wt%, the film shows the highest EM wave absorption performance, which exhibits the effective absorption bandwidth of 2.72 GHz with the matching thickness of only 2.0 mm. These results indicate that PI-based films have a certain potential application in the area of EM wave-absorbing materials.

中文翻译：

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具有电磁波吸收性能的聚酰亚胺/碳纳米管复合薄膜的制备及性能

制备了包含 3,3',4,4'-联苯四羧酸二酐 (BPDA)、对苯二胺 ( p -PDA) 和 CNT的聚酰亚胺 (PI)/碳纳米管 (CNT) 薄膜，这些薄膜具有显着的电磁 (EM) ) 吸波性能。机械性能、热稳定性、热膨胀系数 (CTE)、玻璃化转变温度 (T _g ) 的实验分析) 和 EM 参数揭示了碳纳米管对所得复合膜的有益影响。特别是当CNTs的含量为6wt%时，薄膜表现出最高的电磁波吸收性能，其有效吸收带宽为2.72 GHz，匹配厚度仅为2.0 mm。这些结果表明基于PI的薄膜在电磁波吸收材料领域具有一定的潜在应用。