静电纺制备Fe3O4/PEK-C纳米复合膜及其吸波性能

静电纺丝技术是一种新颖、高效且简单的制备连续纳米纤维的方法,纳米复合纤维膜的优异特点赋予了纳米吸波剂新的吸波通道。本文采用静电纺丝工艺制备Fe3O4/PEK-C纳米复合纤维膜,利用SEM和TGA表征纳米复合纤维膜的微观形貌和热稳定性,用矢量网络分析仪测试样品在8.2~12.4 GHz的电磁参数与吸波性能。结果表明,Fe3O4/PEK-C纳米复合纤维膜呈现出超细纤维彼此交织构成的立体网络结构,其热稳定性、复介电常数和复磁导率均随着Fe3O4含量的增加而增加,介电损耗和磁损耗得到加强。当纳米复合纤维膜的厚度为1.8 mm时,其反射损耗在整个测试波段均处于-5 dB以下,-10 dB以下有效吸收频宽为2 GHz,频率在8.6 GHz处吸收强度达到最大值-15.4 dB。预期可作为隐身复合材料的吸波功能层。

Synthesis and microwave absorbing properties of electrospun Fe3O4/PEK-C composite membranes

Electrostatic spinning technology is a novel, efficient and simple method for the preparation of continuous nanofibers. The excellent characteristics of nanocomposite fiber membranes provide new absorption channels for nanoabsorbents. In this paper, Fe₃O₄/PEK-C composite nanofiber membranes were fabricated by electrospinning technique. The surface micro-topography and thermal stability were characterized by scanning electron microscope (SEM) and thermal gravimetric analysis (TGA). The electromagnetic parameters and microwave absorption properties were measured in the frequency range of 8.2~12.4 GHz. The results indicated that the Fe₃O₄/PEK-C composite nanofiber membranes exhibited a spatial network structure formed by the interweaving of superfine fibers. The thermal stability, complex permittivity and permeability, dielectric and magnetic loss of the nanofiber membranes increased with the increasing Fe₃O₄ content. The reflection loss exceeding -5 dB was obtained in 8.2~12.4 GHz for the composite nanofiber membrane specimens with the thickness of 1.8 mm, and the bandwidth of reflection loss below -10 dB was 2 GHz. The maximum reflection loss of -15.4 dB was achieved at 8.6 GHz. Electrostatic spinning technology is a novel, efficient and simple method for the preparation of continuous nanofibers.