As a bio-based polyamide, polypentamethylene adipate (PA56) is restricted in many fields due to its flammability. In this research, flame-retardant PA56 copolymers (FRPA56s) were designed and successfully synthesized with the introduction of 9,10-dihydro-10-[2,3-di(hydroxy carbonyl)propyl]-10-phosphaphenanthrene-10-oxide (DDP) unit. The thermal properties, thermal degradation and flame behavior of the resultant copolymer were investigated by DSC, TGA, LOI, UL-94 and cone calorimeter tests, respectively. Compared to PA56, the peak value of heat release rate and total heat release of FRPA56 containing 1.2 mol% DDP decrease by 35% and 19%, respectively, indicating the high flame-retardant efficiency of DDP. It is also found that FRPA56 with only 1.0 mol% DDP passes V-0 grade in the UL-94 test while its thermal performance is almost the same as homopolymer PA56. The pyrolysis products in both the condensed and gas phases were further systematically analyzed by SEM, Raman, FTIR, X-ray photoelectron spectroscopy and TGA-GC/MS. The flame-retardant mechanism was also proposed for FRPA56s.

作为一种生物基聚酰胺，聚己二酸戊二酯（PA56）由于其易燃性而在许多领域受到限制。本研究通过引入 9,10-dihydro-10-[2,3-di(羟基羰基)丙基]-10-phosphaphenanthrene-10-oxide 设计并成功合成了阻燃 PA56 共聚物 (FRPA56s)。 DDP) 单位。分别通过 DSC、TGA、LOI、UL-94 和锥形量热仪测试研究了所得共聚物的热性能、热降解和火焰行为。与PA56相比，含有1.2 mol% DDP的FRPA56的放热峰​​值和总放热峰值分别降低了35%和19%，表明DDP具有较高的阻燃效率。还发现FRPA56只有1个。0 mol% DDP 在 UL-94 测试中通过 V-0 级，而其热性能与均聚物 PA56 几乎相同。通过SEM、拉曼、FTIR、X射线光电子能谱和TGA-GC/MS进一步系统地分析了冷凝相和气相中的热解产物。还提出了 FRPA56 的阻燃机制。