Package Driven Mechanically Robust Cnf/Ppy-Mxene Aerogel Composites with Outstanding Electromagnetic Shielding and Flame Retardancy

Abstract

In today's digital era, electromagnetic radiation pollution stands as a dual-edged sword, not only diminishing the efficacy of sophisticated electronic devices but also threatening human health in substantial ways. As a result, the pursuit of advanced electromagnetic shielding materials has ascended to the forefront of research priorities, underscoring their crucial role in mitigating these risks. In this study, we have modified MXene through pyrrole polymerization to produce a modified PPy-MXene solution. By employing the "Concreting" method, flame retardant modified MXene aerogel composites were fabricated. Our results demonstrate a substantial improvement in the performance of the C1M2MTFRs composite compared to cellulose nanofiber (CNF)/ thermoplastic polyurethane (TPU). Specifically, the peak heat total heat release (THR), release rate (PHRR), peak CO2 production rate (PCO2PR), peak smoke production rate (PSPR) and total smoke release (TSR) were reduced by 46.7%, 67.7%, 71.4%, 71.7% and 77.3%, respectively. Moreover, the average electromagnetic interference shielding effectiveness of C1M2MTFRs in the X-band and K-band reached 67.3 dB and 91.4 dB, respectively. Additionally, compared to the cellulose aerogel (CA), the mechanical strength of the aerogel composites was notably enhanced, with compressive stress increased by a factor of 3.2.

Keywords: Electromagnetic Interference Shielding, Concreting method, Mechanical strength, Flame retardancy