Polypyrrole nanotube derived flame-retardant substrate of cellulose nanofiber composites with thermal conductive and electromagnetic interference shielding effect

In this work, the substrate of cellulose nanofiber (CNF) with polypyrrole (PPy) nanotube (PNT) composite (named as SF/PNT) membranes were prepared using vacuum filtration, which provided effective network for conducting electron and heat, simultaneously endowing the membranes with excellent thermal conductive performance and electromagnetic interference shielding effectiveness (EMI SE, 34.2 dB). Meanwhile, the SF/PNT composite membranes showed the electrical conductivity around 613 S/m, which also presented certain mechanical properties, with the latent heat of 155.2 J/g. In particular, the presence of Mg(OH) 2 and PNT network contributed remarkable anti-dripping performance and flame-retardant properties to the membranes during combustion. The provided novel SF/PNT composites indicated promise for a wide variety of applications in thermal energy storage, battery thermal management system , microelectronic packaging and smart buildings.