Dual Fire Retardant Action: The Combined Gas and Condensed Phase Effects of Azo-Modified NiZnAl Layered Double Hydroxide on Intumescent Polypropylene
Dual Fire Retardant Action: The Combined Gas and Condensed Phase Effects of Azo-Modified NiZnAl Layered Double Hydroxide on Intumescent Polypropylene
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双重阻燃作用：偶氮改性 NiZnAl 层状双氢氧化物对膨胀聚丙烯的气体和凝聚相联合效应
DOI：
10.1021/acs.iecr.6b03953
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发表时间：
2017
影响因子：
4.2
通讯作者：
Quantong Zhang
中科院分区：
文献类型：
--
作者：
Pengji Wang;Xiaoping Hu;Duijun Liao;Yi Wen;T. Richard Hull;Fei Miao;Quantong Zhang
合成了三元镍取代层状双氢氧化物ZnNiAl-CO 3 LDH（C-LDH）。采用离子交换法将其与偶氮苯-4，4 ′-二甲酸插层，得到有机改性的NiZnAl LDH（O-LDH）。将两种LDHs与膨胀型阻燃剂（IFR）熔融共混到聚丙烯（PP）中。对插层LDH及其杂化复合材料的结构、形貌、热稳定性和燃烧性能进行了全面的表征。扫描电子显微镜和能量色散X射线图谱表明，O-LDH比C-LDH具有更好的分散性。锥形量热法表明，IFR和LDH的加入显著降低了烟和热的释放速率。具有1 wt % O-LDH的复合材料表现出双气相和凝相阻燃作用，表现出最低的可燃性，极限氧指数值为29.3%，并达到UL-94 V-0等级。另外，LDH的加入提高了PP/IFR复合材料的力学性能。紫外吸收表明，O-LDH能显著提高PP复合材料的紫外稳定性。
A ternary nickel-substituted layered double hydroxide, ZnNiAl-CO3LDH (C-LDH), was synthesized. It was intercalated with azobenzene-4,4′-dicarboxylic acid using an ion exchange method to obtain organically modified NiZnAl LDH (O-LDH). Both LDHs were melt-blended into polypropylene (PP) with an intumescent fire retardant (IFR). The structure, morphology, thermal stability, and combustible properties of intercalated LDH and its hybrid composite have been comprehensively characterized. Scanning electron microscopy and energy-dispersive X-ray mapping showed that O-LDH exhibits better dispersion than C-LDH. Cone calorimetry showed that the addition of IFR and LDH significantly reduces the smoke and heat release rates. The composite with 1 wt % O-LDH, which showed dual gas-phase and condensed-phase fire retardant action, exhibited the lowest flammability with an limiting oxygen index value of 29.3% and achieved a UL-94 V-0 rating. In addition, incorporation of LDH improved the mechanical properties compared with PP/IFR composites. UV absorption showed that O-LDH could significantly improve the UV stability of PP composites.