Flame Resistance of Polylactic Acid With Cyclophosphazene Derivative and NiAl Layered Double Hydroxide Doped Zn

NiAl layered double hydroxide doped Zn with dodecylbenzenesulfonate anions (NiZnAl) was prepared by one‐step coprecipitation method. Hexaphenoxycyclotriphosphazene (HPCP) is a cyclophosphazene derivative. NiZnAl first combined with HPCP were used to prepare polylactic acid (PLA) composites. Effect of NiZnAl and HPCP on flame retardancy of PLA was investigated. NiZnAl exhibited nano‐dispersion in PLA composites, and its layers were intercalated by PLA chains. Limiting oxygen index value of all the PLA composites with incorporation of HPCP and NiZnAl increased, and UL‐94 tests passed V0 ratings. With the presence of NiZnAl in PLA/HPCP composites, the amount of graphite crystalline carbon after burning was increased. High peak of heat release rate, heat release capacity, and the total heat release had a big reduction. The amount of char residue was increased apparently. The thermal degradation process was delayed. The summary results suggested that NiZnAl and HPCP had a good synergistic flame retardant effect in PLA. POLYM. COMPOS., 39:3994–3999, 2018. © 2017 Society of Plastics Engineers