Jianming Yang, Hu Wang, Yali Zhang, Hexin Zhang* and Junwei Gu*. Layered structural PBAT composite foams for efficient electromagnetic interference shielding. Nano-Micro Letters, 2024, 16: 31. DOI:10.1007/s40820-023-01246-8. 2023IF=31.6. (1区材料科学Top期刊,中国科技期刊卓越行动计划-领军类期刊项目)

https://doi.org/10.1007/s40820-023-01246-8

Abstract

The utilization of eco-friendly, lightweight, high-efficiency and high-absorbing electromagnetic interference (EMI) shielding composites is imperative in light of the worldwide promotion of sustainable manufacturing. In this work, magnetic poly (butyleneadipate-coterephthalate) (PBAT) microspheres were firstly synthesized via phase separation method, then PBAT composite foams with layered structure was constructed through the supercritical carbon dioxide foaming and scraping techniques. The merits of integrating ferroferric oxide loaded multi-walled carbon nanotubes (Fe3O4@MWCNTs) nanoparticles, a microcellular framework, and a highly conductive silver layer have been judiciously orchestrated within this distinctive layered configuration. Microwaves are consumed throughout the process of “absorption-reflection-reabsorption” as much as possible, which greatly declines the secondary radiation pollution. The biodegradable PBAT composite foams achieved an EMI shielding effectiveness of up to 68 dB and an absorptivity of 77%, and authenticated favorable stabilization after the tape adhesion experiment.

在全球倡导可持续制造的背景下，开发环保、轻质、高效和高吸收电磁干扰（EMI）屏蔽复合材料势在必行。本工作首先通过相分离法合成了磁性聚（己二酸丁二醇酯-对苯二甲酸丁二酯）（PBAT）微球，然后通过超临界二氧化碳发泡和刮涂技术构建了具有层状结构的PBAT基电磁屏蔽复合泡沫。这种独特结构巧妙地融合了四氧化三铁负载多壁碳纳米管（Fe3O4@MWCNTs）纳米粒子、微孔骨架和高导电银层的优点。微波在整个“吸收-反射-再吸收”的过程中被尽可能地消耗，从而大大减少了二次电磁辐射污染。可生物降解PBAT复合泡沫的电磁屏蔽效能高达68 dB，吸收电磁波效率为77%，并在胶带粘接实验中表现出良好的稳定性。

论文亮点

1. 借助相分离法成功合成了磁性可降解PBAT微球，并利用隔离网络设计和超临界发泡技术制备了层状结构PBAT-Fe3O4@MWCNTs/Ni/Ag复合泡沫。

2. Fe3O4@MWCNTs纳米粒子和微孔结构的引入有效强化磁损耗和多重反射吸收作用，形成了“吸收-反射-再吸收”的电磁屏蔽机制。

3. 层状结构复合材料的平均电磁屏蔽效能达到了68.0 dB，对电磁波的反射率可降低至23％，且在500次胶带粘接实验中表现出良好的屏蔽稳定性。

第一作者：杨建明

邮件地址：Jianming1072@163.com

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