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Vol. 13 (2021)

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

https://doi.org/10.1007/s40820-021-00693-5
Ting Wang
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Wei‑Wei Kong
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Wan‑Cheng Yu
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Jie‑Feng Gao
The College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, People’s Republic of China
Kun Dai
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, People’s Republic of China
Ding‑Xiang Yan
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China
Zhong‑Ming Li
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, People’s Republic of China

Corresponding Author: Zhong‑Ming Li

zmli@scu.edu.cn

Nano-Micro Letters, Vol. 13 (2021), Article Number: 162

Abstract

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.


Highlights:


1 The cationic waterborne polyurethanes microspheres with Diels-Alder bonds were synthesized for the first time.
2 The electrostatic attraction not only endows the composite with segregated structure to gain high electromagnetic-interference shielding effectiveness, but also greatly enhances mechanical properties.
3 Efficient healing property was realized under heating environment.

Keywords

Electrostatic attraction Healable EMI shielding Diels–Alder reaction
Wang, Ting, Wei‑Wei Kong, Wan‑Cheng Yu, Jie‑Feng Gao, Kun Dai, Ding‑Xiang Yan, and Zhong‑Ming Li. 2021. “A Healable and Mechanically Enhanced Composite With Segregated Conductive Network Structure for High-Efficient Electromagnetic Interference Shielding”. Nano-Micro Letters 13 (August):162. https://doi.org/10.1007/s40820-021-00693-5.
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