Flexible Polyurethane@Ti3C2Tx/Silver Nanowires Composite Films with Cocontinuous Segregated Structures for Superior Electromagnetic Interference Shielding and Joule Heating

The booming development of communication technology and electronic equipment has put forward higher requirements of flexibility, electromagnetic interference (EMI) shielding performances, and service reliability for the EMI shielding materials. Herein, the flexible polyurethane@Ti 3 C 2 T x /silver nanowires (PU@Ti 3 C 2 T x /AgNWs) composite films with cocontinuous segregated structures are developed by a facile layer‐by‐layer hydrogen bonding assembly followed by hot‐pressing approach using PU sponge as the 3D skeleton template. Benefiting from the cocontinuous segregated structures, the flexible composite films exhibit high electrical and mechanical properties, excellent EMI shielding, and Joule heating performances. The EMI SE of the composite films can reach as high as 88 dB in X‐band (8.2–12.4 GHz). At a supplied voltage of 4.0 V, the composite films exhibit a high steady‐state Joule heating temperature up to 116.7 °C. The flexible cocontinuous segregated composite films with high working stability show great application potentials in EMI shielding and Joule heating systems in aerospace, weapon equipment, and wearable devices.