Abstract

A simple but effective method was proposed to promote the flame retardancy of blended fibers based on the synergistic effect between flame retardant fibers. The flame retardant viscose (FRV) is blended with three kinds of nitrogen-containing intrinsic flame-retardant fibers (NIFRFs), respectively. The limiting oxygen index, cone calorimeter test, thermogravimetric analysis coupled with Fourier transform infrared, scanning electron microscopy, X-ray photoelectron spectroscopy, and the laser Raman spectroscopy are used to have a comprehensive investigation on the flame retardant properties and mechanism of blended fibers. Results show that there is an obvious synergistic effect between FRV and NIFRFs. However, it is found that the improvements in flame retardancy of fiber blends have no direct relationship with the nitrogen content of NIFRFs. The difference of thermal degradation temperature (T_dmax) has more influence on the synergistic flame retardancy of the two fibers. The closer the T_dmax of FRV and NIFRF is, the more obvious the synergistic effect between blended fibers is. The residual char of blended fibers are all more compact and integrated than those of pure fibers. The FRV/poly(m-phenylene isophthalamide) (PMIA) 20/80 has the highest LOI of 47.5%, showing the best flame retardancy.

Graphic abstract

中文翻译：

---

阻燃粘胶与含氮固有阻燃纤维的协同效应

摘要

根据阻燃纤维之间的协同作用，提出了一种简单有效的方法来提高混纺纤维的阻燃性。阻燃粘胶（FRV）分别与三种含氮固有阻燃纤维（NIFRFs）混合。极限氧指数，锥形量热仪测试，热重分析，傅立叶变换红外光谱，扫描电子显微镜，X射线光电子能谱和激光拉曼光谱被用于对混纺纤维的阻燃性能和机理进行全面研究。结果表明，FRV和NIFRF之间具有明显的协同作用。然而，发现纤维共混物的阻燃性的改善与NIFRF的氮含量没有直接关系。_dmax）对两种纤维的协同阻燃性有更大的影响。FRV和NIFRF的T _dmax越近，混合纤维之间的协同作用越明显。混合纤维的残余炭比纯纤维的残余炭更致密和整合。FRV /聚（间亚苯基间苯二甲酰胺）（PMIA）20/80的最高LOI为47.5％，显示出最佳的阻燃性。

图形摘要