A Healable and Mechanically Enhanced Composite with Segregated Conductive Network Structure for High?Efficient Electromagnetic Interference Shielding

• 作者: Ting Wang Wei?Wei Kong Wan?Cheng Yu Jie?Feng Gao Kun Dai Ding?Xiang Yan Zhong?Ming Li
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（11）
• 页码范围: 18-31
• 页数: 14页
• 语种: 英文

摘要

It is still challenging for conductive polymer composite-based electromagnetic interference (EMI) shielding materials to achieve long-term stability while maintaining high EMI shielding effectiveness (EMI SE), especially undergoing external mechanical stimuli, such as scratches or large deformations. Herein, an electrostatic assembly strategy is adopted to design a healable and segregated carbon nanotube (CNT)/graphene oxide (GO)/polyu?rethane (PU) composite with excellent and reliable EMI SE, even bearing complex mechanical condition. The negatively charged CNT/GO hybrid is facilely adsorbed on the surface of positively charged PU microsphere to moti?vate formation of segregated conductive networks in CNT/GO/PU composite, establishing a high EMI SE of 52.7 dB at only 10 wt％ CNT/GO loading. TheDiels–Alder bonds in PU microsphere endow the CNT/GO/PU composite suffering three cutting/healing cycles with EMI SE retention up to 90％. Additionally, the electrostatic attraction between CNT/GO hybrid and PU microsphere helps to strong interfacial bonding in the composite, resulting in high tensile strength of 43.1 MPa and elongation at break of 626％. The healing efficiency of elongation at break achieves 95％ when the composite endured three cutting/healing cycles. This work demonstrates a novel strategy for developing segregated EMI shielding composite with healable features and excellent mechanical performance and shows great potential in the durable and high precision electrical instruments.