Flame retardant behavior of multi-scale layered PBT/IFR composites

This study first prepared a layered intumescent flame retardant (IFR)-graphene oxide (GO). Then, the multi-scale polybutylene terephthalate (PBT) composites were prepared by introducing glass fiber (GF), boron nitride (BN), and nano SiO 2 flame retardant synergists of different shapes and sizes. The results showed that the SiO 2 -containing composites displayed excellent flame resistance with a flame retardant grade of V-0 and a limiting oxygen index (LOI) of 32%. The IFR-GO, PBT, and SiO 2 formed a multi-scale network structure where the three additives interacted via hydrogen bonding, catalyzing charring in situ. Finally, the composites were obtained with an excellent flame retardant grade and droplet resistance properties.