Synthesis of heptamolybdate‐intercalated MgAl LDHs and its application in polyurethane elastomer |
| |
| Authors: | Wen‐Zong Xu Shao‐Qing Wang Liang Liu Yuan Hu |
| |
| Affiliation: | 1. School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei, China;2. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, China |
| |
| Abstract: | Heptamolybdate (Mo7O246?) was intercalated in the interlayer space between MgAl‐layered double hydroxides (Mo‐MgAl LDHs) by the hydrothermal and ion exchange method, and then polyurethane elastomer (PUE) based composites were prepared by the prepolymerization method with different amounts of Mo‐MgAl LDHs. X‐ray diffraction (XRD), Fourier transform infrared (FTIR) spectra, laser Raman spectroscopy (LRS), and scanning electron microscopy (SEM) were employed to characterize the obtained LDHs. The performance of the PUE/LDHs were evaluated by measuring their thermal gravimetric, heat release rate (HRR), and smoke density (Ds). The results show that PUE/LDH composites exhibit a lower peak heat release rate (pk‐HRR), Ds, and a prolonged combustion time, in comparison with neat PUE. Comparison between NO3‐MgAl LDHs and Mo‐MgAl LDHs containing composites show that the introduction of Mo6+ is able to facilitate flame retardance and smoke suppression efficiency, which results mainly from the presence of MoO3 derived from the decomposition of Mo7O246? intercalated LDHs. Mo‐MgAl LDHs reduce the pk‐HRR of composites by 39% with only 1 wt.% content, and the maximum Ds of composites is reduced to a minimal value of 274 with 10 wt.% Mo‐MgAl LDHs. More importantly, LDHs would improve the mechanical properties at a low content. The experimental results reveal the potential of Mo7O246? intercalated LDHs to improve both the flame retardancy and smoke suppression of PUE. Copyright © 2015 John Wiley & Sons, Ltd. |
| |
| Keywords: | layered double hydroxides heptamolybdate polyurethane elastomer flame retardance smoke suppression |
|
|
