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 

机构地区：[1]College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,People’s Republic of China [2]The College of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225009,People’s Republic of China [3]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,People’s Republic of China [4]School of Aeronautics and Astronautics,Sichuan University,Chengdu 610065,People’s Republic of China

出　　处：《Nano-Micro Letters》2021年第11期18-31,共14页纳微快报（英文版）

基　　金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(Grant Nos.51973142,51721091,21878194);the National Key Research and Development Program of China(2018YFB0704200);the funds of the State Key Laboratory of Solidification Processing(Northwestern Polytechnical University)(SKLSP201918).

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)/polyurethane(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 motivate 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.The Diels–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.

关 键 词：Electrostatic attraction Healable EMI shielding Diels–Alder reaction 

分 类 号：TB332[一般工业技术—材料科学与工程]