Abstract A novel polymeric mono-component intumescent flame retardant poly(piperazine methylphosphonic acid neopentylglycol ester) (PPMPNG) was synthesized from methylphosphonic acid, piperazine and neopentyl glycol. Its chemical structure was detailed characterized by Fourier transform infrared spectroscopy (FTIR), 13C and 31P solid-state nuclear magnetic resonance. PPMPNG was incorporated into polyethylene (PE) and the flame retardancy, thermal properties and flame retardant mechanism of materials were investigated. The samples with the thickness of 1.6 mm passed UL-94 V-0 rating during vertical burning tests and the limiting oxygen index was 25.6% when 23 wt% PPMPNG was introduced. The results of thermogravimetric analysis (TGA) showed that the addition of PPMPNG promoted the degradation and carbonization of materials at the beginning and improved the char residue amount and thermal stability of FR-PE at high temperature. Cone calorimeter tests indicated that the peak value of heat release rate was considerably reduced with the incorporation of PPMPNG. The flame retardant mechanism showed PPMPNG exerted isolation effect in condensed phased and quenched active free radical effect in gas phase. The combustion intensity was reduced and the flame was suppressed and even extinguished, thus a high efficiency for PE matrix was achieved.

中文翻译：

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新型单组分膨胀型阻燃剂的合成及其高效阻燃聚乙烯

摘要 以甲基膦酸、哌嗪和新戊二醇为原料，合成了一种新型高分子单组分膨胀型阻燃剂聚（哌嗪甲基膦酸新戊二醇酯）（PPMPNG）。通过傅里叶变换红外光谱 (FTIR)、13C 和 31P 固态核磁共振对其化学结构进行了详细表征。将 PPMPNG 掺入聚乙烯 (PE) 中，研究了材料的阻燃性、热性能和阻燃机制。在垂直燃烧测试中，厚度为 1.6 mm 的样品通过了 UL-94 V-0 等级，当引入 23 wt% PPMPNG 时，极限氧指数为 25.6%。热重分析(TGA)结果表明，PPMPNG的加入在初期促进了材料的降解和碳化，提高了FR-PE在高温下的残炭量和热稳定性。锥形量热仪测试表明，随着 PPMPNG 的加入，热释放率的峰值显着降低。阻燃机理表明PPMPNG在凝聚相中发挥隔离作用，在气相中淬灭活性自由基作用。燃烧强度降低，火焰被抑制甚至熄灭，从而实现了PE基体的高效率。锥形量热仪测试表明，随着 PPMPNG 的加入，热释放率的峰值显着降低。阻燃机理表明PPMPNG在凝聚相中发挥隔离作用，在气相中淬灭活性自由基作用。燃烧强度降低，火焰被抑制甚至熄灭，从而实现了PE基体的高效率。锥形量热仪测试表明，随着 PPMPNG 的加入，热释放率的峰值显着降低。阻燃机理表明PPMPNG在凝聚相中发挥隔离作用，在气相中淬灭活性自由基作用。燃烧强度降低，火焰被抑制甚至熄灭，从而实现了PE基体的高效率。