Abstract:

Through the two-step modification of carbon nanotubes (CNT), the P, N-rich organic-inorganic hybrid structure (HPCNT) was obtained by grafting polypyrrole onto the P, N-rich phosphoronitrile unit, which was added into PP matrix as filler. Compared with pure CNT, the inclusion layer on the surface of hybrid structure has stronger interface force and interface compatibility with the matrix, so it presents a good dispersion state, and then it can effectively form a physical barrier network. At the same time, its rich P, N elements will provide a certain degree of flame retardant, and can promote the formation of carbon. When 3% HPCNT was added, PHRR and THR changed to 987 kW/m² and 111 MJ/m² respectively, which decreased by 31.6% and 15.3% respectively. PCOY and PCO2Y decreased by 20.8% and 31.7%, respectively, to 0.57 mg/m³ and 11.44%.

Key words: polypropylene, carbon nanotubes, polypyrrole; fire risk