阻燃剂
烧焦
材料科学
热稳定性
极限氧指数
锥形量热计
化学工程
结晶
烟雾
磷腈
高分子化学
复合材料
燃烧
有机化学
聚合物
化学
工程类
作者
Xiaoyu Sun,Lingling Li,Yubin Yang,Chunfeng Jia,Xiaolei Zhang,Jingxuan Wu,Zhe Zhu,Junsheng Wang,Jinjun Yang
标识
DOI:10.1007/s10853-021-06719-y
摘要
A hyperbranched and amorphous microsphere (PZM) was synthesized with the hexachlorocyclotriphosphazene (HCCP) as the component unit. The PZM and ammonium polyphosphate (APP) as a synergistic flame retardant were incorporated into the poly(L-lactic acid) (PLA) to investigate the effects of the APP/PZM on the thermal stability, limiting oxygen index (LOI), UL-94 rating, combustion behavior, flame-retardant performance and crystallization behavior of the PLA. The PZM showed a much higher thermal stability and carbon residue than the HCCP, APP and 4,4'-diaminodiphenyl ether (ODA), but presented a lower initial degradation temperature. The PLA/10%APP/5%PZM exhibited the most excellent flame-retardant performance because it showed low total heat release, peak of heat release and total smoke release. By calculation, the PLA/10%APP/5%PZM presented the outstanding fire resistance. The PLA/10%APP/5%PZM formed a continuous, dense and relatively thicker char layer (which facilitated the isolation of the oxygen and heat flow, suppression of the smoke and prevention of the dripping) after the cone calorimeter (CONE) test, indicating that it showed a condensed-phase flame-retardant performance. In addition, the gas-phase flame retardance is a minor factor to enhance its flame-retardant effect. The crystallizability increased, and crystallization time shortened substantially for the PLA with loading of the 10%APP/5%PZM.Graphical abstract
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