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Preparation and characterization of porous polyimide fibers with electromagnetic wave absorption properties
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2022-07-22 , DOI: 10.1002/pen.26089
Ming Jiang 1 , Daolei Lin 1 , Wei Jia 1 , Jiang Du 1 , Hongqing Niu 1 , Xiaodong Wang 1 , Dezhen Wu 1
Affiliation  

The porous polyimide (PI) composite fibers, which exhibit high-efficiency electromagnetic wave adsorption (EMWA) performance, were successfully fabricated by controlling temperature of the coagulation bath during the wet spinning process. The mechanical properties of composite fiber decreased and average radius of micropores increased gradually with the rise of coagulation bath temperature. In addition, carbon nanotubes (CNTs) and nano-Fe3O4 were introduced into the system by in situ polymerization. CNTs and nano-Fe3O4 contribute to the attenuation of electromagnetic wave (EMW) through microwave absorption and reflection loss (RL), and the porous structure was able to provide multiple reflection paths for incident EMW and achieved higher attenuation. Particularly, when the temperature of coagulation bath was 50°C, the minimum RL (RLmin) value of the PI/CNTs/nano-Fe3O4 (PI/C-Fe) composite fibers was demonstrated to be −54.61 dB with the matching thickness of 2.10 mm. The successful preparation of PI/C-Fe composite fiber in this study pointed out a new direction for the application of PI-based fiber materials in structural EMWA materials.

中文翻译:

具有电磁波吸收性能的多孔聚酰亚胺纤维的制备与表征

通过控制湿法纺丝过程中凝固浴的温度,成功制备出具有高效电磁波吸附(EMWA)性能的多孔聚酰亚胺(PI)复合纤维。随着凝固浴温度的升高,复合纤维的力学性能逐渐降低,平均微孔半径逐渐增大。此外,通过原位聚合将碳纳米管(CNTs)和纳米Fe 3 O 4引入体系中。碳纳米管和纳米Fe 3 O 4通过微波吸收和反射损耗(RL)有助于电磁波(EMW)的衰减,并且多孔结构能够为入射的EMW提供多条反射路径并实现更高的衰减。特别是当凝固浴温度为 50°C 时, PI/CNTs/nano-Fe 3 O 4 (PI/C-Fe) 复合纤维的最小 RL (RL min ) 值为-54.61 dB。匹配厚度为 2.10 毫米。本研究成功制备PI/C-Fe复合纤维,为PI基纤维材料在结构EMWA材料中的应用指明了新方向。
更新日期:2022-07-22
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