Flexible thermoplastic polyurethane/reduced graphene oxide composite foams for electromagnetic interference shielding with high absorption characteristic
Flexible thermoplastic polyurethane/reduced graphene oxide composite foams for electromagnetic interference shielding with high absorption characteristic
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DOI：
10.1016/j.compositesa.2019.05.017
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发表时间：
2019-08-01
影响因子：
8.7
通讯作者：
Li, Guangxian
中科院分区：
文献类型：
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作者：
Jiang, Qiuyue;Liao, Xia;Li, Guangxian
采用超临界CO2发泡法制备了用于电磁干扰屏蔽（EMI SE）的轻质柔性热塑性聚氨酯/还原氧化石墨烯（TPU/RGO）复合泡沫材料。通过L-抗坏血酸原位还原形成的氢键相互作用，使发泡样品具有良好的界面结合力和柔韧性。scCO（2）发泡后形成多级泡孔，有效地降低了样品的密度，泡孔大小取决于RGO的含量。TPU/RGO复合材料中偏析结构的形成对材料的导电性有显著的影响。由于具有良好导电网络的多级蜂窝结构，仅用3.17体积%的RGO负载就实现了21.8 dB的屏蔽效率。此外，蜂窝结构的引入增强了样品的电磁屏蔽吸收特性。这一结果表明，一个有前途的方法来制造柔性和轻质复合泡沫材料的吸收为主的电磁干扰屏蔽。
Lightweight and flexible thermoplastic polyurethane/reduced graphene oxide (TPU/RGO) composite foams for electromagnetic interference shielding (EMI SE) were fabricated through a supercritical CO2 foaming method. The hydrogen-bond interaction formed through in-situ reduction by L-ascorbic acid in samples contributed to good interface adhesion and good flexibility of foamed samples. Multistage cellular were formed after scCO(2) foaming, in this way, the density of samples was effectively reduced and the size of cells depends on the content of RGO. And the constructing of segregated structure in TPU/RGO composites contributed significantly to the electrical conductivity of samples. Shielding effectiveness of 21.8 dB was achieved with only 3.17 vol% RGO loading owing to the multistage cellular structure with good conductive network. In addition, the introduction of cellular structure enhanced the electromagnetic shielding absorption characteristic of the samples. This result demonstrated a promising method to fabricate flexible and lightweight composite foams for absorption-dominated electromagnetic interference shielding.