期刊
NANO RESEARCH
卷 14, 期 11, 页码 3926-3934出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-021-3317-z
关键词
layered double hydroxide; thermoplastic polyurethane; smoke suppression; synergistic effect
类别
资金
- Qinghai Provincial Major Science and Technology Special Project [2020-GX-A1]
- National Natural Science Foundation of China (NSFC) [21776018, 21521005, U170760003, 21905014]
- Fundamental Research Funds for the Central Universities [XK1803-5]
The combination of APP and MgFe-LDH effectively reduced smoke density, production rate, and heat release rate of TPU composites. MgFe-LDH also showed high efficiency in decreasing total volatile products and toxic volatiles.
Considerable smoke and toxic volatiles generation has compromised the application of thermoplastic polyurethane (TPU) and caused a great threat to human life. Here, nano-MgFe layered double hydroxide (MgFe-LDH) with uniform particle size was synthesized to reduce smoke density and toxic gases of TPU composites using ammonium polyphosphate (APP) as a flame retardant agent. The results show that the combination of 16 wt.% APP and 4 wt.% MgFe-LDH greatly decreased the smoke density (D-20min and D-s,D- max), smoke production rate (SPR) and heat release rate (HRR) of TPU composites. Furthermore, the MgFe-LDH synergist demonstrated high efficiency in decreasing total volatiled products and toxic volatiles evolved, such as the CO, HCN and isocyanates. The reason was mainly attributed to the chemical reaction between MgFe-LDH and APP, which can promote the compactness of char layers with fine microstructure formed in the decomposition process of MgFe-LDH/APP/TPU composites. The protective char layers could act as barriers between combustion zone and matrix to protect the unburned substrate and promote smoke suppression effect.
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