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區材料科學Top期刊,中國科技期刊卓越行動計劃-領軍類期刊項目)
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.
在全球倡導可持續制造的背景下，開發環保、輕質、高效和高吸收電磁干擾（EMI）屏蔽復合材料勢在必行。本工作首先通過相分離法合成了磁性聚（己二酸丁二醇酯-對苯二甲酸丁二酯）（PBAT）微球，然后通過超臨界二氧化碳發泡和刮涂技術構建了具有層狀結構的PBAT基電磁屏蔽復合泡沫。這種獨特結構巧妙地融合了四氧化三鐵負載多壁碳納米管（Fe3O4@MWCNTs）納米粒子、微孔骨架和高導電銀層的優點。微波在整個“吸收-反射-再吸收”的過程中被盡可能地消耗，從而大大減少了二次電磁輻射污染。可生物降解PBAT復合泡沫的電磁屏蔽效能高達68 dB，吸收電磁波效率為77%，并在膠帶粘接實驗中表現出良好的穩定性。
論文亮點
1. 借助相分離法成功合成了磁性可降解PBAT微球，并利用隔離網絡設計和超臨界發泡技術制備了層狀結構PBAT-Fe3O4@MWCNTs/Ni/Ag復合泡沫。
2. Fe3O4@MWCNTs納米粒子和微孔結構的引入有效強化磁損耗和多重反射吸收作用，形成了“吸收-反射-再吸收”的電磁屏蔽機制。
3. 層狀結構復合材料的平均電磁屏蔽效能達到了68.0 dB，對電磁波的反射率可降低至23％，且在500次膠帶粘接實驗中表現出良好的屏蔽穩定性。
第一作者：楊建明
郵件地址：Jianming1072@163.com
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