查看文章

The intumescent flame retardant (IFR) technique has been considered as an alternative to halogen-based flame retardants for reducing the fire hazards of polymers, especially highly flammable polyolefins. However, the IFR technique possesses certain disadvantages, such as unsatisfactory flame retardant efficiency, high loading requirements, and toxic smoke release. In this study, zeolite imidazolate frameworks-8 (ZIF-8), a common type of metal–organic frameworks (MOFs), was incorporated into an IFR/polypropylene (IFR/PP) composite system as a synergist to further improve flame retardant efficiency and reduce the smoke emission. The results show that ZIF-8 and the IFR additives exhibit a strong synergistic effect between them for improvement of the formation and stability of the intumescent char layer, to prevent the intensive burning of PP. By adding only 2 wt % of ZIF-8, its limiting oxygen index value …