Melamine cyanurate tailored by base and its multi effects on flame retardancy of polyamide 6
Melamine cyanurate tailored by base and its multi effects on flame retardancy of polyamide 6
复制标题
碱定制的三聚氰胺氰尿酸酯及其对聚酰胺6阻燃性能的多重影响
DOI：
10.1016/j.apsusc.2018.06.215
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发表时间：
2018-10
影响因子：
6.7
通讯作者：
Li Juan
中科院分区：
文献类型：
--
作者：
Tao Wei;Li Juan
在本文中，含氮碱基腺嘌呤（A）、鸟嘌呤（G）、胞嘧啶（C）和尿嘧啶（U）被用来定制三聚氰胺氰尿酸盐（MCA）的氢键网络，并分别记为A-MCA、G-MCA、C-MCA、U-MCA。结果表明，MCA 的尺寸、形貌和热行为由于碱之间形成氢键而受到碱的调节。这些改性MCA被用来提高聚酰胺6（PA6）的阻燃性能，通过极限氧指数（LOI）和垂直燃烧（UL-94）测试等方法进行评估。结果表明，含有9wt% C-MCA的PA6样品达到了UL-94V-0等级，LOI值为30.7%，而其他含有等量MCA的样品仅通过了UL-94V-2等级。研究了其阻燃机理，结果表明，尺寸较小的C-MCA与PA6的接触面积更大，有利于催化PA6的分解；因此PA6/C-MCA比其他材料释放更多的NH3、CO2等，并产生更多的液滴，稀释可燃气体并带走热量使样品熄灭。
In this paper, nitrogenous bases adenine (A), guanine (G), cytosine (C), and uracil (U), were used to tailor the hydrogen-bonded network of melamine cyanurate (MCA) and were noted as A-MCA, G-MCA, C-MCA, U-MCA, respectively. The results showed that the size, morphology and thermal behavior of MCA are regulated by base due to the formation of hydrogen bonds between them. These modified MCAs were used to improve the flame retardancy of polyamide 6 (PA6) which was evaluated by using the limiting oxygen index (LOI) and the vertical burning (UL-94) test, etc. The results showed that the PA6 sample containing 9 wt% C-MCA achieves the UL-94 V-0 rating and has a LOI value of 30.7%, while the other samples with equal amounts of MCA only pass the UL-94 V-2 rating. The flame retardant mechanism was studied, and the results reveal that C-MCA with smaller size has greater contact area with PA6 which helps to catalyze the decomposition of PA6; Thus the PA6/C-MCA releases more NH3, CO2etc., and produces more droplets than others, which dilutes combustible gas and takes away heat to make the samples extinguish.
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