▎ 摘　　要

In this article, we report the synthesis of polymer-functionalized graphene composites as highly potent flame retardants. Functionalized polyaniline (PANI)- and polypyrrole (PPy)-supported graphene nanocomposites were synthesized by the reaction of graphene oxide, and monomers of the above-mentioned polymers, aniline and pyrrole, respectively, in the presence of phosphoric acid. These synthesized nanocomposites show excellent flame-retardant properties when coated with cotton fabric and wood. When G-fPANI and G-fPPy solutions were coated on a cloth piece which was exposed to a flame its initial shape and size were sustained by liberating a little amount of smoke. At the initial stage, the coated cloth did not catch fire for more than 620 s (10.20 min) and 380 s (6.20 min) in case of G-fPANI and G-fPPy, respectively, whereas the use of only PANI, PPy, and GO coated on blank cloths were totally burned within 14, 10, and 10 s, respectively. Blank cloth subjected to fire was totally burned within 10 s, leaving small amounts of black mass. Flame-retardant efficiency of G-fPANI- and G-fPPy-coated cloth was confirmed by detailed flame tests such as a limiting oxygen test (LOI), vertical flammability test, and exposure to high temperature (similar to 1500 degrees C). In the case of the LOI test, G-fPANI- and G-fPPy-coated cloths show high values up to 47.6 and 41.9 indicating an excellent flame-retardant property. Like cotton fiber, wood was also used to check the flame-retardant nature of prepared nanocomposites, and it showed good results. This is the first time such a novel approach has been made to prepare polymer-functionalized graphene nanocomposites as a flame retardant for fire prevention using a simple, cost-effective route in comparison to prior work.