The design of flame retardants based on environment-friendly perspective is an increasingly promising strategy to meet the requirements of sustainable development. Herein, combining with the advantages of sustainability and high thermal stability of phytic acid and phosphazene, a novel mono-component intumescent flame retardant hexakis (4-aminophenoxy) cyclotriphosphazene-phytic acid with microporous nanosheet morphology (HACP-PA) is synthesized via template-free self-assembly, which assembles carbon source, acid source and gas source into one molecular structure. The fire retardancy of HACP-PA was evaluated by UL-94, limiting oxygen index (LOI), and cone calorimeter. With 5 wt% HACP-PA loading into PLA, the UL-94 V-0 rating was achieved, and the LOI value increased to 24.2%. Compared with PLA, the addition of 5 wt% HACP-PA resulted in 21.5% and 15.3% reductions in the total heat release (THR) and the peak heat release rate (pHRR) of PLA composites, respectively. Moreover, the total smoke production (TSP) also significantly decreased by 31.0%, and the combustible volatile products are remarkably reduced by the incorporation of HACP-PA. This work provides an effective approach to improve the fire-retarding performance and crystallization performance of PLA by introducing sustainable bio-based intumescent flame retardant with a unique nanosheet structure.

基于环境友好的阻燃剂设计是满足可持续发展要求的越来越有前景的策略。在此，结合植酸和磷腈的可持续性和高热稳定性的优点，通过模板合成了一种具有微孔纳米片形态的新型单组分膨胀型阻燃剂六（4-氨基苯氧基）环三磷腈 - 植酸（HACP-PA）-自由自组装，将碳源、酸源和气体源组装成一个分子结构。HACP-PA的阻燃性通过UL-94、极限氧指数（LOI）和锥形量热仪进行评价。在 PLA 中加入 5 wt% HACP-PA 后，达到了 UL-94 V-0 等级，并且 LOI 值增加到 24.2%。与 PLA 相比，添加 5 wt% HACP-PA 的结果为 21。PLA 复合材料的总放热 (THR) 和峰值放热率 (pHRR) 分别降低了 5% 和 15.3%。此外，总烟量（TSP）也显着降低了31.0%，可燃挥发物因HACP-PA的掺入而显着减少。这项工作通过引入具有独特纳米片结构的可持续生物基膨胀型阻燃剂，为提高 PLA 的阻燃性能和结晶性能提供了一种有效的方法。