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

Nano-Micro Letters

Wan-Cheng Yu¹  Ting Wang¹  Zhong-Ming Li¹  Wei-Wei Kong¹  Ding-Xiang Yan²  Kun Dai³  Jie-Feng Gao⁴ 

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

关键词: Electrostatic attraction;    Healable;    EMI shielding;    Diels–Alder reaction;   

DOI  :  10.1007/s40820-021-00693-5

来源: Springer

【 摘 要 】

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

【 授权许可】

CC BY