Synergistic flame retardancy of tris(1‐methoxy‐2,2,6,6‐tetramethyl‐piperidin‐4‐yl) phosphite (NORPM) and tris(2,4,6‐tribromophenoxy)‐1,3,5‐triazine (TTBPC)/Sb₂O₃ in high‐impact polystyrene (HIPS) was studied by limiting oxygen index (LOI) determination, UL‐94 test, and cone calorimetry test (CCT). NORPM has an exceptional synergistic effect in HIPS. When the dosage of TTBPC, Sb₂O₃, and NORPM was 12.8, 3.2, and 0.5 wt% respectively, flame retardant effectivity and synergistic effectivity were 0.424 and 1.15 respectively. Compared with the Flame retardant (FR)‐HIPS containing 16.0 wt% of TTBPC/Sb₂O₃, the LOI of FR‐HIPS increases from 23.8% to 25.4%, the flame‐retardant rating of FR‐HIPS can be improved from UL 94 V‐2 to V‐0, and the peak heat release rate and total heat release are significantly reduced by combining NORPM in 0.5 wt% concentration. NORPM induces the synergistic effect mainly through the following mechanisms: the active radicals produced by the pyrolysis of NORPM promote the release of bromine radicals from TTBPC and the formation of HBr, which improves the flame retardancy of TTBPC; the above active radicals, together with HBr, quench active free radicals, such as the hydroxyl radical (·OH) and decompose the free radical source, which interrupts the chain reaction during combustion and results in a more efficient flame retardant effect in gaseous phase.

中文翻译：

---

三（1-甲氧基-2,2,2,6,6-四甲基-哌啶-4-基）亚磷酸酯和三（2,4,6-三溴苯氧基）-1,3,5-三嗪/ Sb2O3的协同阻燃性冲击聚苯乙烯

三（1-甲氧基-2,2,2,6,6-四甲基哌啶-4-基）亚磷酸酯（NORPM）和三（2,4,6-三溴苯氧基）-1,3,5-三嗪（通过极限氧指数（LOI）测定，UL-94测试和锥量热测试（CCT）研究了高冲击聚苯乙烯（HIPS）中的TTBPC）/ Sb ₂ O ₃。NORPM在HIPS中具有特殊的协同作用。当TTBPC，Sb ₂ O ₃和NORPM的剂量分别为12.8、3.2和0.5wt％时，阻燃效果和协同效果分别为0.424和1.15。与包含16.0 wt％的TTBPC / Sb ₂ O _3的阻燃剂（FR）-HIPS相比，FR‐HIPS的LOI从23.8％提高到25.4％，FR‐HIPS的阻燃等级可以从UL 94 V‐2提高到V‐0，并且峰值放热率和总放热显着提高通过以0.5 wt％的浓度结合NORPM来降低。NORPM主要通过以下机制诱导协同作用：NORPM热解产生的活性自由基促进TTBPC中溴自由基的释放和HBr的形成，从而提高TTBPC的阻燃性。上述活性基团与HBr一起淬灭了活性自由基，例如羟基自由基（·OH）并分解了自由基源，从而中断了燃烧过程中的链反应，并在气相中产生了更有效的阻燃效果。