Fabrication And Electromagnetic Microwave Absorption Properties Of Electrospun Ferrite/PEK-C Composite Nanofiber Membranes

With the development of science and technology, the electromagnetic wave plays a considerable role in military applications. stealth technology also has become the most important and the most effective means in modern military penetration technology, and attaches great importance to by the world's military powers. And stealth materials is the key of stealth technique, modern stealth materials is moving toward "thin, light, wide and strong" direction, and the electrostatic spinning technique was used to prepare nanofibers with light weight, large length to diameter ratio, high porosity, large specific surface area, et al. Therefore the electrostatic spinning technology in preparation of absorbing material has a broad space for development.This paper adopts high voltage electrostatic spinning to prepared PEK-C nanofiber membrane, Fe₃O₄ /PEK-C nano fiber membrane, Fe₃O₄/CNTs /PEK-C hybrid composite nanofiber membrane, and Fe₃O₄@C/PEK-C compound film. With the help of SEM, XRD, TG, DMA and vector network analyzer method test for microstructure, thermal stability, mechanical properties, and the electromagnetic wave absorption performance of the thin film. The research results show that the Fe₃O₄/PEK-C nanofiber membrane rendering with ultra-fine fiber interlaced together formate the three-dimensional network structure. The addition of Fe₃O₄ nanoparticles improved the thermal stability,the complex permittivity and complex magnetic permeability of the composite nanofiber membrane. The reflection loss of Fe₃O₄/PEK-C nanofiber membrane throughout the x-band?8.2 12.4 GHz? are under – 5 dB, the bandwidth below- 10 dB up to 2 GHz, maximum absorption reach-15.4 dB at 8.6 GHz. Complex dielectric constant of Fe₃O₄/CNTs/ PEK-C hybrid composite nanofiber membrane increases with the increase of the content of CNTs in 8.2 ¹2.4 GHz, but the complex permeability decreased with the increase of CNTs content, Compared with no carbon nanotube Fe₃O₄/PEK-C nanofiber membrane, Fe₃O₄/CNTs/PEK-C hybrid composite nanofiber membrane get stronger absorption and wider bandwidth under the same thickness, shows that the addition of CNTs have more advantageous for the electromagnetic match, significantly improve the absorbing performance of the hybrid composite nanofibre membrane. Fe₃O₄@C nanometer fiber absorbing agent is well absorption in the low frequency, absorption peak for-26 dB located at 2.1 GHz when the thickness of coaxial sample is 6 mm. The reflectivity of Fe₃O₄@C/PEK-C compound film are all under-10 dB within the scope of 5.8 to 7.8 GHz when the thickness of film is 2.5 mm, and the maximum value reach-23 dB at 5.8 GHz.