具有多尺度导电网络的柔性聚二甲基硅氧烷复合材料用于超强电磁干扰防护
Flexible Polydimethylsiloxane Composite with Multi-Scale Conductive Network for Ultra-Strong Electromagnetic Interference Protection.
作者信息
Li Jie, Sun He, Yi Shuang-Qin, Zou Kang-Kang, Zhang Dan, Zhong Gan-Ji, Yan Ding-Xiang, Li Zhong-Ming
机构信息
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, People's Republic of China.
School of Aeronautics and Astronautics, Sichuan University, Chengdu, 610065, People's Republic of China.
出版信息
Nanomicro Lett. 2022 Dec 29;15(1):15. doi: 10.1007/s40820-022-00990-7.
HIGHLIGHTS
A multi-scale conductive network was constructed in flexible PDMS/Ag@PLASF/CNT composite with micro-size Ag@PLASF and nano-size CNT. The PDMS/Ag@PLASF/CNT composite showed outstanding electrical conductivity of 440 S m and superior electromagnetic interference shielding effectiveness of up to 113 dB. The PDMS/Ag@PLASF/CNT composites owned good retention (> 90%) of electromagnetic interference shielding performance even after subjected to a simulated aging strategy or 10,000 bending-releasing cycles.
ABSTRACT
Highly conductive polymer composites (CPCs) with excellent mechanical flexibility are ideal materials for designing excellent electromagnetic interference (EMI) shielding materials, which can be used for the electromagnetic interference protection of flexible electronic devices. It is extremely urgent to fabricate ultra-strong EMI shielding CPCs with efficient conductive networks. In this paper, a novel silver-plated polylactide short fiber (Ag@PLASF, AAF) was fabricated and was integrated with carbon nanotubes (CNT) to construct a multi-scale conductive network in polydimethylsiloxane (PDMS) matrix. The multi-scale conductive network endowed the flexible PDMS/AAF/CNT composite with excellent electrical conductivity of 440 S m and ultra-strong EMI shielding effectiveness (EMI SE) of up to 113 dB, containing only 5.0 vol% of AAF and 3.0 vol% of CNT (11.1wt% conductive filler content). Due to its excellent flexibility, the composite still showed 94% and 90% retention rates of EMI SE even after subjected to a simulated aging strategy (60 °C for 7 days) and 10,000 bending-releasing cycles. This strategy provides an important guidance for designing excellent EMI shielding materials to protect the workspace, environment and sensitive circuits against radiation for flexible electronic devices. [Image: see text]
SUPPLEMENTARY INFORMATION
The online version contains supplementary material available at 10.1007/s40820-022-00990-7.
亮点
在含有微米尺寸的Ag@PLASF和纳米尺寸的碳纳米管（CNT）的柔性聚二甲基硅氧烷（PDMS）/Ag@PLASF/CNT复合材料中构建了多尺度导电网络。PDMS/Ag@PLASF/CNT复合材料表现出440 S/m的出色电导率以及高达113 dB的卓越电磁干扰屏蔽效能。即使经过模拟老化处理或10000次弯曲-释放循环后，PDMS/Ag@PLASF/CNT复合材料仍具有良好的电磁干扰屏蔽性能保持率（>90%）。
摘要
具有优异机械柔韧性的高导电聚合物复合材料（CPCs）是设计优良电磁干扰（EMI）屏蔽材料的理想材料，可用于柔性电子设备的电磁干扰防护。制造具有高效导电网络的超强EMI屏蔽CPCs迫在眉睫。本文制备了一种新型镀银聚乳酸短纤维（Ag@PLASF，AAF），并将其与碳纳米管（CNT）结合，在聚二甲基硅氧烷（PDMS）基体中构建多尺度导电网络。该多尺度导电网络赋予柔性PDMS/AAF/CNT复合材料440 S/m的优异电导率和高达113 dB的超强电磁干扰屏蔽效能（EMI SE），其中仅含有5.0体积%的AAF和3.0体积%的CNT（导电填料含量为11.1wt%）。由于其优异的柔韧性，即使经过模拟老化处理（60℃，7天）和10000次弯曲-释放循环后，该复合材料仍分别表现出94%和90%的EMI SE保持率。该策略为设计优良的EMI屏蔽材料以保护柔性电子设备的工作空间、环境和敏感电路免受辐射提供了重要指导。[图片：见正文]
补充信息
在线版本包含可在10.1007/s40820-022-00990-7获取的补充材料。
Zotero 插件