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

• DOI: 10.1007/s40820-021-00693-5
• Publication Date: 2021-08-02T06:02:30Z
• Authors: Ting Wang; Wei-Wei Kong; Wan-Cheng Yu; Jie-Feng Gao; Kun Dai; Ding-Xiang Yan; Zhong-Ming Li
• Keywords: Technology; EMI shielding; Diels–Alder reaction; T; Electrostatic attraction; 02 engineering and technology; Healable; 0210 nano-technology; Article

The cationic waterborne polyurethanes microspheres with Diels-Alder bonds were synthesized for the first time. electrostatic attraction not only endows composite segregated structure to gain high electromagnetic-interference shielding effectiveness, but also greatly enhances mechanical properties. Efficient healing property was realized under heating environment. It is still challenging conductive polymer composite-based electromagnetic interference (EMI) materials achieve long-term stability while maintaining EMI effectiveness (EMI SE), especially undergoing external stimuli, such as scratches or large deformations. Herein, an assembly strategy adopted design a healable and carbon nanotube (CNT)/graphene oxide (GO)/polyurethane (PU) excellent reliable SE, even bearing complex condition. negatively charged CNT/GO hybrid facilely adsorbed on surface of positively PU microsphere motivate formation networks in CNT/GO/PU composite, establishing SE 52.7 dB at 10 wt% loading. endow suffering three cutting/healing cycles retention up 90%. Additionally, between helps strong interfacial bonding resulting tensile strength 43.1 MPa elongation break 626%. efficiency achieves 95% when endured cycles. This work demonstrates novel developing features performance shows great potential durable precision electrical instruments.