Synthesis and Application in Polypropylene of a Novel Nitrogen-Containing Intumescent Flame-Retardant

A nitrogen-containing blowing agent, poly(2-piperazinylene-4-morpholino-1,3,5-triazine) (PPMT), was synthesised for use as the gas resource in an intumescent flame-retardant system. Nickel (II) acetate, as a synergistic agent, was used in order to improve the flame retardancy of polypropylene. PPMT was characterised by Fourier transform infrared spectroscopy. A variety of characterisation methods including limiting oxygen index, thermogravimetric analysis, and the UL-94 flammability test were applied to evaluate the flame-retardancy and thermal stability of flame-retardant polypropylene.