Structural design of multifunctional PET non‐woven fabric with porous dual‐network for infrared stealth, flame retardant, and electromagnetic interference shielding

With rapid advances in electronic and communication technology, electromagnetic interference and other problems are becoming increasingly prominent. Thus, electromagnetic interference shielding materials have recently garnered extensive attention. In this study, a multi‐walled carbon nanotube/polyurethane/nonwoven electromagnetic shielding material (CPNW) was developed using impregnation and nonsolvent induce phase separation techniques. Utilizing a three‐dimensional nonwoven network as the substrate, the “nonwoven fabric‐polyurethane‐carbon nanotube” composite was impregnated and cured via the nonsolvent induce phase separation method, resulting in a distinctive porous dual‐network structure that ensures robust interfacial bonding between carbon nanotubes, nonwoven fabric, and polyurethane. At a carbon nanotube content of 10% (based on the mass of nonwoven fabric), CPNW exhibited an electromagnetic interference shielding effectiveness of 28.8 dB, a thermal conductivity of 0.127 W m‐1 K‐1, and a burning time of 1 minute and 15 seconds, demonstrating outstanding electromagnetic shielding, flame retardant, and infrared stealth capabilities. Overall, this study laid a theoretical groundwork for the development of multifunctional nonwoven electromagnetic shielding materials with widespread application potential in aerospace, military, artificial intelligence, and wearable electronics. This article is protected by copyright. All rights reserved.