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W. Z. Xu, S. Q. Wang, L. Liu and Y. Hu (2016) Polymers for Advanced Technologies 27 250-257.
Date: 2017-03-09   Author: SKLFS   Source: SKLFS   Keywords: layered double hydroxides; heptamolybdate; polyurethane elastomer; flame; retardance; smoke suppression; LAYERED DOUBLE HYDROXIDES; FLAME-RETARDANT; THERMAL-STABILITY
 

W. Z. Xu, S. Q. Wang, L. Liu and Y. Hu (2016) Synthesis of heptamolybdate-intercalated MgAl LDHs and its application in polyurethane elastomer. Journal/Polymers for Advanced Technologies 27 250-257. [In English]
Web link: http://dx.doi.org/10.1002/pat.3628
Keywords: layered double hydroxides; heptamolybdate; polyurethane elastomer; flame; retardance; smoke suppression; LAYERED DOUBLE HYDROXIDES; FLAME-RETARDANT; THERMAL-STABILITY; MOLYBDENUM; NANOCOMPOSITES; BEHAVIOR; ANIONS

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 (C) 2015 John Wiley & Sons, Ltd.

 
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Relevant link
Du LC, Qu BJ (2006b) Journal of Materials Chemistry 16(16), 1549-1554.
Du LC, Qu BJ (2007) Polymer Composites 28(2), 131-138.
Chen W, Qu BJ (2004) Journal of Materials Chemistry 14(11), 1705-1710.
Chen W, Qu BJ (2003a) Chemistry of Materials 15(16), 3208-3213.
Li BG, Hu Y, Zhang R, Chen ZY, Fan WC (2003b) Materials Research Bulletin 38(11-12), 1567-1572.
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