Abstract

In this study, shielding effectiveness for a few composite films was examined. Composites were prepared by combining thermoplastic polyurethane, polyaniline and ferrite cobalt. The composites were synthesized in several steps by the hydrothermal and melt blending method. Different tests were performed to characterize ferrite cobalt, polyaniline/ferrite cobalt and final ternary composite. The effect of weight percentage of each component, the thickness of composite on electromagnetic interference shielding effectiveness was studied. The sample with an average of 36.7 dB in the X-band had the best performance and the highest amount at 10.9 GHz was achieved (SE_T = 41.83). The results showed that absorption and reflection had two effective mechanisms for shielding. Also, the absorption coefficient with 78% of total shielding effectiveness was highest and polyaniline had a significant role in the absorption mechanism. Besides, the thickness was a key factor for production of wave-absorbent composites. Finally, by using the design-expert software, optimization was performed to achieve the SE_T ≥ 20 and it was found that the composite should have the following parameters: ferrite cobalt content in polyaniline (16.25 wt %), polyaniline/ferrite cobalt content in thermoplastic polyurethane (63.66 wt %) and a thickness of 1.22 mm.

中文翻译：

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热塑性聚氨酯/聚苯胺/铁氧体钴复合材料在X带区的有效吸收剂的合成与优化

摘要

在这项研究中，检查了一些复合膜的屏蔽效果。通过组合热塑性聚氨酯，聚苯胺和铁氧体钴来制备复合材料。通过水热和熔融共混法分几步合成了复合材料。进行了不同的测试以表征铁氧体钴，聚苯胺/铁氧体钴和最终三元复合材料。研究了各组分的重量百分比，复合材料的厚度对电磁干扰屏蔽效果的影响。X波段平均36.7 dB的样本具有最佳性能，并且在10.9 GHz处达到最高数量（SE _T= 41.83）。结果表明，吸收和反射具有两种有效的屏蔽机制。另外，在总屏蔽效果中占78％的吸收系数最高，聚苯胺在吸收机理中起着重要作用。此外，厚度是生产吸波复合材料的关键因素。最后，通过使用设计专家软件，进行优化以实现SE _Ť ≥20并且发现该复合应具有以下参数：在聚苯胺铁氧体钴含量（16.25重量％），聚苯胺/铁氧体钴含量热塑性聚氨酯（63.66 wt％），厚度为1.22 mm。