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SFPC课题组电磁屏蔽复合材料工作发表在Nano-Micro Letters上.

Lei Wang, Zhonglei Ma, Hua Qiu*, Yali Zhang, Ze Yu, Junwei Gu*. Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures. Nano-Micro Letters, 2022, 14: 224. 2021IF=23.655.

https://doi.org/10.1007/s40820-022-00949-8

Abstract

High?efficiency electromagnetic interference (EMI) shielding materials is of great importance for electronic equipment reliability, information security and human health. In this work, bidirectional aligned Ti3C2Tx@Fe3O4/CNF aerogels (BTFCA) were firstly assembled by bidirectional freezing and freeze-drying technique, and the BTFCA/epoxy nanocomposites with long-range aligned lamellar structures were then prepared by vacuum-assisted impregnation of epoxy resins. Benefitting from the successful construction of bidirectional aligned three-dimensional conductive networks and electromagnetic synergistic effect, when the mass fraction of Ti3C2Tx and Fe3O4 are 2.96 wt% and 1.48 wt%, BTFCA/epoxy nanocomposites show outstanding EMI shielding effectiveness of 79 dB, about 10 times of that of blended Ti3C2Tx@Fe3O4/epoxy (8 dB) nanocomposites with the same loadings of Ti3C2Tx and Fe3O4. Meantime, the corresponding BTFCA/epoxy nanocomposites also present excellent thermal stability (Theat-resistance index of 198.7oC) and mechanical properties (storage modulus of 9902.1 MPa, Young''s modulus of 4.51 GPa and hardness of 0.34 GPa).

高性能电磁屏蔽材料对电子设备的可靠性、信息安全和人体健康具有重要意义。本文通过“双向冷冻-冷冻干燥-热还原”技术制备双向有序Ti3C2Tx@Fe3O4/CNF气凝胶(BTFCA),再经真空浸渍环氧树脂制备出具有长程有序层状结构的BTFCA/环氧树脂纳米复合材料。得益于双向有序3D导电网络和电磁复合体系的构建,当Ti3C2Tx和Fe3O4质量分数分别为2.96 wt%和1.48 wt%时,BTFCA/环氧树脂纳米复合材料展现出优异的电磁屏蔽性能,其屏蔽效能(EMI SE)高达79 dB,是相同Ti3C2Tx和Fe3O4用量下共混Ti3C2Tx@Fe3O4/环氧树脂纳米复合材料EMI SE(8 dB)的9.9倍。BTFCA/环氧树脂纳米复合材料还具有优异的热稳定性(耐热指数=198.7oC)和力学性能(储能模量=9902.1 MPa、杨氏模量=4.51 GPa、硬度=0.34 GPa)。

本文亮点

1. 借助“双向冷冻-冷冻干燥-真空浸渍”技术成功制备出长程有序结构的BTFCA/环氧树脂纳米复合材料。

2. 长程有序结构的构建和电磁协同作用能够显著提升BTFCA/环氧树脂纳米复合材料的屏蔽效能,并降低二次污染。

3. BTFCA/环氧树脂纳米复合材料不但展示出高达79 dB的屏蔽性能,而且兼具优异的热稳定性和力学性能。


第一作者:王雷

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