Compositional and structural design of thermoplastic polyurethane/carbon based single and multi-layer composite sheets for high-performance X-band microwave absorbing applications
Compositional and structural design of thermoplastic polyurethane/carbon based single and multi-layer composite sheets for high-performance X-band microwave absorbing applications
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DOI：
10.1016/j.polymer.2019.121672
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发表时间：
2019-10-10
期刊：
影响因子：
4.6
通讯作者：
Durmus, Ali
中科院分区：
文献类型：
--
作者：
Kasgoz, Alper;Korkmaz, Mehmet;Durmus, Ali
采用溶液共混法制备了不同种类和不同用量的炭黑（CB）、石墨（G）、碳纳米管（CNF）和多壁碳纳米管（MWCNT）等碳填料的热塑性聚氨酯复合材料，研究了材料的形态特征、介电性能和吸波性能。利用扫描电镜和矢量网络分析仪分别对复合材料的微观结构和吸波性能进行了分析。复合材料的反射损耗（RL）分析表明，CNF和CNT比CB和G更有效地改善片材的电磁波吸收性能在低填料含量。结果发现，最宽的有效吸收面积（EAA）（10.03-12.96 GHz）与样品具有3 phr的CNF。然而，单层TPU/碳复合材料片材不是有效的“雷达隐身”材料，因为它们的RL值在X波段高于-10 dB。因此，多层（二，三，四层）复合结构的设计，以获得更高的微波吸收性能在该频率范围内，通过遗传算法的方法。多层设计和建模工作表明，总厚度为4.8mm的四层复合材料具有优异的吸波性能和宽的EAA，在X波段为6.98-13.415 GHz。
In this study, morphological features, dielectric properties, and microwave absorbing performances of thermoplastic polyurethane composite sheets prepared with solution mixing method by using different amounts and types of carbon fillers, carbon black (CB), graphite (G), carbon nanofiber (CNF), and multiwalled carbon nanotube (MWCNT) were investigated, in detail. Microstructural properties and microwave absorbing characteristics of composites were analyzed with scanning electron microscope and vector network analyzer by transmission line method, respectively. Reflection loss (RL) analyses of composites showed that CNF and CNT were more efficient than CB and G for improving the electromagnetic wave absorbing performances of sheets at low filler contents. It was found that the broadest effective absorption area (EAA) (10.03-12.96 GHz) was obtained with the sample having 3 phr of CNF. However, single layer TPU/carbon composite sheets were not effective "RADAR stealth" materials because their RL values were higher than -10 dB at X-band. Thus, multilayer (two, three, and four-layer) composite structures were designed to obtain higher microwave absorption performance within this frequency range via genetic algorithm approach. Multilayer design and modeling works showed that a four-layer composite with a total thickness of 4.8mm yielded excellent microwave absorbing performance and broad EAA, 6.98-13.415 GHz, at X-band.