Herein, a bridged 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO) derivative (PN‐DOPO) in combination with organ‐montmorillonite (OMMT) was used to improve the flame retardancy and mechanical properties of glass‐fiber‐reinforced polyamide 6 T (GFPA6T). The flame retardancy and thermal stabilities of the cured GFPA6T composites were investigated using limiting oxygen index, vertical burning (UL‐94) test, cone calorimeter test, and thermogravimetric analysis (TGA). The morphological analysis and chemical composition of the char residues after cone calorimeter tests were characterized via scanning electron microscopy and energy dispersive spectrometry. The results indicate that 2 wt% OMMT combined with 13 wt% PN‐DOPO in GFPA6T achieved a V‐0 rating in UL‐94 test. The peak heat release rate and total smoke release remarkably decreased with the incorporation of OMMT as compared to those of GFPA6T/15 wt% PN‐DOPO. The TGA results show that the thermal stability and residual mass of the samples effectively increased with the increase in OMMT content. The morphological analysis and composition structure of the residues demonstrate that a small amount of OMMT could help form a more thermally stable and compact char layer during combustion. Also, with the incorporation of OMMT, the layers consisted of more carbon‐silicon and aluminum phosphate char in the condensed phase. Furthermore, GFPA6T/PN‐DOPO/OMMT composites exhibited excellent mechanical properties in terms of flexural modulus, flexural strength, and impact strength than the GFPA6T/PN‐DOPO system. The combination of PN‐DOPO and OMMT has improved the flame retardancy and smoke suppression of GFPA6T without compromising the mechanical properties.

中文翻译：

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DOPO基衍生物和有机蒙脱石对玻璃纤维增​​强聚酰胺6 T的协同阻燃作用

在本文中，使用桥联的9,10-二氢-9-氧杂-10-磷菲10氧化物（DOPO）衍生物（PN-DOPO）与器官蒙脱石（OMMT）组合以提高阻燃性和机械性能玻璃纤维增​​强聚酰胺6 T（GFPA6T）。使用极限氧指数，垂直燃烧（UL-94）测试，锥形量热仪测试和热重分析（TGA）对固化的GFPA6T复合材料的阻燃性和热稳定性进行了研究。通过扫描电子显微镜和能量色散法表征了锥形量热仪测试后的焦炭残留物的形态分析和化学组成。结果表明，GFPA6T中2 wt％的OMMT与13 wt％的PN-DOPO组合在UL-94测试中达到了V-0等级。与GFPA6T / 15 wt％PN-DOPO相比，加入OMMT的峰值放热速率和总烟雾释放量显着降低。TGA结果表明，样品的热稳定性和残余质量随着OMMT含量的增加而有效增加。残留物的形态分析和组成结构表明，少量的OMMT有助于在燃烧过程中形成更热稳定的致密炭层。另外，随着OMMT的加入，这些层在凝结相中由更多的碳硅和磷酸铝焦组成。此外，与GFPA6T / PN-DOPO系统相比，GFPA6T / PN-DOPO / OMMT复合材料在弯曲模量，弯曲强度和冲击强度方面表现出优异的机械性能。