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

Abstract

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

An overview of the recent advances in flame retarded poly(lactic acid)

“…They have high modification flexibility, mainly including graphene, [113][114][115][116][117][118][119] clay, 120,121 and layered double hydroxide (LDH). 122,123 Nanofillers alone cannot meet the flame-retardant requirements of polymers, and their agglomeration tendency and poor interfacial compatibility with the matrix will damage the mechanical properties. Therefore, nanoparticles usually combine with other FRs, especially with IFR, to improve the interface interaction and flame retardancy.…”

“…In recent years, the preparation of nanocomposites using nanoparticles and polymers has attracted great attention due to its excellent performance 104–106 . Polymers loaded with nanofillers as low as 1–5 wt% can improve flammability and thermal stability 107–129 . Nanofillers have large specific surface area, high thermal stability, excellent physical, and mechanical properties, which can act as a carbon layer during combustion, improve the density of the carbon layer and delay heat transfer.…”

“…2D nanoscale FRs are layered materials with strong in‐plane chemical bonds and weak interlayer force. They have high modification flexibility, mainly including graphene, 113–119 clay, 120,121 and layered double hydroxide (LDH) 122,123 . Nanofillers alone cannot meet the flame‐retardant requirements of polymers, and their agglomeration tendency and poor interfacial compatibility with the matrix will damage the mechanical properties.…”