四川大学 高分子科学与工程学院 高分子材料工程国家重点实验室
目前电磁辐射环境日益严重，电磁屏蔽材料的研究与开发得到高度重视，制备低密度、高吸波性能的电磁屏蔽材料成为当前研究的热点。本文通过铁钴合金改性碳纳米管(FeCo@CNT)和MXene两种填料的联用，以热塑性聚氨酯(TPU)为基体材料，利用二氧化碳(CO2)间歇发泡法成功制备了TPU/FeCo@CNT/MXene三明治复合泡沫材料。通过矢量网络仪分析电磁屏蔽性能，结果表明，三明治复合泡沫材料展现频率选择性电磁屏蔽，且屏蔽峰频率随发泡条件变化，从9.2 GHz提高至13.0 GHz。同时，实现电磁屏蔽材料轻量化，在密度为0.76 g·cm-3时，平均电磁屏蔽性能可达53.7 dB.
The research and development of electromagnetic shielding materials have been attached great importance because of the serious electromagnetic radiation environment. The preparation of electromagnetic shielding materials with low density and high absorbing performance has become a hot topic in current research. In this paper, TPU/FeCo@CNT/MXene sandwich composite foam was successfully prepared by carbon dioxide (CO2) foaming method using thermoplastic polyurethane (TPU) as matrix material by combination of FeCo-alloy-modified carbon nanotube (FeCo@CNT) and MXene fillers. The electromagnetic shielding performance was analyzed by vector network analyzer. Results showed that sandwich composite foams possessed frequency selective electromagnetic shielding feature, and the frequency at shielding peak moved from 9.2 GHz to 13.0 GHz as foaming condition varied. Efficient angel lightweight electromagnetic interference shielding material was realized in foam with density of 0.76 g·cm-3 and an average electromagnetic interference shielding effectiveness of 53.7 dB.