In this work, a series of intumescent flame retarded polybutylene succinate (PBS) formulations have been developed based on ethylenediamine phosphate (EDAP) and different co-additives, i.e., zinc borate, melamine borate, zinc molybdate, and aminated multiwall carbon nanotubes, at relatively low loading (10 wt.%). Among them, zinc borate endows the best synergistic flame retardant effect with EDAP in PBS. Cone calorimetry shows that addition of EDAP and zinc borate with a ratio of 8:2 (wt: wt) dramatically reduces the peak heat release rate (pHRR) by 57% as compared to neat PBS, indicating the excellent flame retardant efficiency of this combination used at only 10wt.%. Beside, benefitting from the incorporation of zinc borate, PBS/EDAP/ZnB exhibits excellent smoke suppression and good mechanical properties. Solid state NMR (¹¹B, ¹³C, and ³¹P) gives information to determine the flame retardant mechanism of EDAP and ZnB in PBS. It was found that it involves the formation of a reinforced intumescent char with highly thermally stable inorganic species, which acts as a protective physical barrier increasing the char cohesion and limiting the formation of cracks.

在这项工作中，基于乙二胺磷酸酯 (EDAP) 和不同的共添加剂，即硼酸锌、三聚氰胺硼酸锌、钼酸锌和胺化多壁碳纳米管，开发了一系列膨胀型阻燃聚丁二酸丁二醇酯 (PBS) 配方，在相对较低的负载 (10 wt.%) 下。其中，硼酸锌在PBS中与EDAP的协同阻燃效果最好。锥形量热法显示 EDAP 和硼酸锌的添加比例为 8:2 ( wt: wt) 与纯 PBS 相比，峰值热释放率 (pHRR) 显着降低了 57%，表明仅使用 10wt.% 的这种组合具有出色的阻燃效率。此外，得益于硼酸锌的掺入，PBS/EDAP/ZnB 表现出优异的抑烟性和良好的机械性能。固态 NMR（¹¹ B、¹³ C 和³¹ P）提供了确定 EDAP 和 ZnB 在 PBS 中的阻燃机制的信息。发现它涉及形成具有高度热稳定性无机物种的增强膨胀型炭，其充当保护性物理屏障，增加炭内聚力并限制裂纹的形成。