Synergistic effect between expandable graphite and ammonium polyphosphate on flame retarded polylactide

Synergistic effect between expandable graphite and ammonium polyphosphate on flame retarded polylactide
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可膨胀石墨与聚磷酸铵对阻燃聚丙交酯的协同作用

DOI:
10.1016/j.polymdegradstab.2010.11.017
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发表时间:
2011-02
影响因子:
5.9
通讯作者:
Xue, Lixin
Xue, Lixin
中科院分区:
化学2区
文献类型:
--
作者:
Zhu, Hongfang;Yan, Qing;Zhu, Qiliang;Li, Juan;Tao, Kang;Xue, Lixin

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通过极限氧指数(LOI)、热重分析(TGA)、扫描电镜(SEM)、x射线能谱(XPS)和锥量热仪等测试,观察了可膨胀石墨(EG)和聚磷酸铵(APP)对阻燃聚乳酸(PLA)的协同作用。在实验中,添加15%的APP/EG(1:3)的PLA复合材料在UL-94测试中的LOI值为36.5,V-0等级,大大提高了单独添加APP或EG的复合材料的阻燃性能。热重分析和锥量热分析结果表明,APP/EG在520℃以上的温度下可以通过促进致密炭层的形成来延缓聚合物材料的降解。炭层有效地保护基体内部不受热渗透,防止其进一步降解,从而降低失重率,提高阻燃性能。
Synergistic effect was observed between expandable graphite (EG) and ammonium polyphosphate (APP) on flame retarded polylactide (PLA) in this paper using limiting oxygen index (LOI), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM) and X-ray spectroscopy (XPS) and cone calorimeter tests etc. In the experiments, PLA composites with 15 wt% of APP/EG(1:3) combinations showed a LOI value of 36.5 and V-0 rating in UL-94 tests, greatly improved flame retardant properties from composites with APP or EG alone. Results from TGA and cone calorimeter demonstrated that APP/EG combination could retard the degradation of polymeric materials above the temperature of 520 °C by promoting the formation of a compact char layer. This char layer protects the matrix effectively from heat penetrating inside and prevents its further degradation, resulting in lower weight loss rate and better flame retarded performance.
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