Lightweight and flexible polysulfonamide/polyurethane-CNTs@Ag fiber paper for electromagnetic interference shielding

Nowadays, electromagnetic wave radiation is one of the sources of environmental pollution, which seriously affects human health and and the environment. Fiber paper made from high-performance fibers has shown potential for use in the electromagnetic interference (EMI) shielding due to adapting different complex working environments. However, achieving lightweight, high-efficiency, and flexible electromagnetic shielding remains challenging. To address this issue, we design a lightweight polysulfonamide/polyurethane-CNTs@Ag (PSA/PU-CNTs@Ag) fiber paper with double-layered structure and high electromagnetic shielding efficiency (EMI SE) via vacuum-assisted filtration and heat treatment. The results show the content of Ag nanoparticles 0.3 g in PSA/PU-CNTs@Ag fiber paper, the resistance is less than 1 Ω, the electrical conductivity reaches 883.57 S/m. At the same time, the thickness of Ag film increases, the EMI SE value reaches 90.537 dB. The EMI SE value of PSA/PU-CNTs@Ag fiber paper after folding one thousand times has decreased, but still maintains 95% of the original shielding performance. Moreover, its EMI SE values still maintain above 60 dB in various extreme environments (hot 150 °C, cold −70 °C). In summary, this work shows PSA based EMI shielding materials own excellent overall performance and hold broad different working extreme environments.