SFPC課題組電磁屏蔽復合材料工作發表在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).
高性能電磁屏蔽材料對電子設備的可靠性、信息安全和人體健康具有重要意義。本文通過“雙向冷凍-冷凍干燥-熱還原”技術制備雙向有序Ti3C2Tx@Fe3O4/CNF氣凝膠（BTFCA），再經真空浸漬環氧樹脂制備出具有長程有序層狀結構的BTFCA/環氧樹脂納米復合材料。得益于雙向有序3D導電網絡和電磁復合體系的構建，當Ti3C2Tx和Fe3O4質量分數分別為2.96 wt%和1.48 wt%時，BTFCA/環氧樹脂納米復合材料展現出優異的電磁屏蔽性能，其屏蔽效能（EMI SE）高達79 dB，是相同Ti3C2Tx和Fe3O4用量下共混Ti3C2Tx@Fe3O4/環氧樹脂納米復合材料EMI SE（8 dB）的9.9倍。BTFCA/環氧樹脂納米復合材料還具有優異的熱穩定性（耐熱指數=198.7oC）和力學性能（儲能模量=9902.1 MPa、楊氏模量=4.51 GPa、硬度=0.34 GPa）。
本文亮點
1. 借助“雙向冷凍-冷凍干燥-真空浸漬”技術成功制備出長程有序結構的BTFCA/環氧樹脂納米復合材料。
2. 長程有序結構的構建和電磁協同作用能夠顯著提升BTFCA/環氧樹脂納米復合材料的屏蔽效能，并降低二次污染。
3. BTFCA/環氧樹脂納米復合材料不但展示出高達79 dB的屏蔽性能，而且兼具優異的熱穩定性和力學性能。
第一作者：王雷
郵箱地址：minishiguang@126.com