碳纳米管/聚酰亚胺三明治夹层泡沫的制备及其电磁屏蔽性能

Preparation and Electromagnetic Shielding Properties of Carbon Nanotubes/Polyimide Sandwich Foam

以高弹性碳纳米管泡沫为基础材料,首先制备出高耐热性的碳纳米管/聚酰亚胺薄膜,设计并制备得到以碳纳米管泡沫为芯材、碳纳米管/聚酰亚胺薄膜为板材结构的三明治夹层泡沫。对其结构形貌、压缩性能、导电性、电磁屏蔽性能及热稳定性进行了测试和表征,结果表明:通过改变碳纳米管/聚酰亚胺薄膜的厚度,最终复合泡沫压缩强度可达88.2 kPa,电导率为675 S/m,在X波段的电磁屏蔽效能达到88.3 dB。三明治夹层结构的设计在提升电磁屏蔽性能的同时,也增强了材料的机械性能和耐热性,为设计和制造高电磁屏蔽和优异耐热性的材料提供了一种可行的方法。

Using highly elastic carbon nanotube foam as substrate, carbon nanotube/polyimide films with high heat resistance were prepared. Then, the sandwich foam with highly elastic carbon nanotube foam as core material and carbon nanotubes/polyimide film as surface material was designed and fabricated. The morphology,compression properties, electrical conductivity and electromagnetic shielding performance of the composite foam were characterized. The results show that the compressive strength of the composite foam can reach 88.2 kPa, the electrical conductivity is 675 S/m, and the electromagnetic shielding efficiency in X-band can reach 88.3 dB by changing the thickness of carbon nanotubes/polyimide film. Sandwich structure design not only improves the electromagnetic shielding performance, but also enhances the mechanical properties and heat resistance of materials, providing a method for designing and manufacturing materials with high electromagnetic shielding and excellent heat resistance.