Adjustment of dielectric permittivity and loss of graphene/thermoplastic polyurethane flexible foam: Towards high microwave absorbing performance
Adjustment of dielectric permittivity and loss of graphene/thermoplastic polyurethane flexible foam: Towards high microwave absorbing performance
复制标题
调节石墨烯/热塑性聚氨酯软质泡沫的介电常数和损耗：实现高微波吸收性能
DOI：
10.1016/j.compositesa.2018.10.036
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发表时间：
2019-02-01
影响因子：
8.7
通讯作者：
Guo, Shaoyun
中科院分区：
文献类型：
--
作者：
Gao, Yuan;Wang, Chaozhi;Guo, Shaoyun
一种优良的微波吸收材料应该具有宽的有效带宽（EB）和低的最小反射损耗（min-RL），这取决于介电常数和损耗。本文通过改变发泡比和石墨烯含量，制备了具有良好吸波性能的石墨烯/TPU复合材料。此外，天花板微波吸收性能的介质材料在较低的厚度进行了研究。当泡沫比、石墨烯含量和厚度分别为3.9、0.82体积%和1.6 mm时，获得最佳微波吸收性能，其最小RL为-32.0 dB，EB为4.7 GHz。结果表明，石墨烯/TPU泡沫材料具有较好的吸波性能、较低的填料含量和较薄的厚度。此外，该材料具有良好的柔韧性。
An excellent microwave absorbing material should have wide effective bandwidth (EB) and low minimum reflection loss (min-RL), which depends on dielectric permittivity and loss. In this work, graphene/TPU composites with good microwave absorbing performance were prepared by changing the foam ratio and graphene content. Moreover, ceiling microwave absorbing performance of a dielectric material at a low thickness was investigated. When the foam ratio, graphene content, and thickness are, respectively, 3.9, 0.82 vol%, and 1.6 mm, the best microwave absorbing performance with a min-RL of -32.0 dB and an EB of 4.7 GHz is obtained. As a result, the graphene/TPU foams, which have better microwave absorbing performance, lower filler content, and thinner thickness than other reported polymer/graphene composites, are obtained. Additionally, this material exhibits a good flexibility.