L. Liu, W. Wang and Y. Hu (2015) Layered double hydroxide-decorated flexible polyurethane foam: significantly improved toxic effluent elimination. Journal/Rsc Advances 5 97458-97466. [In English]
Web link: http://dx.doi.org/10.1039/c5ra19414h
Keywords: POSITIVELY CHARGED NANOSHEETS, POLY(VINYL ALCOHOL), ANION-EXCHANGE, FLAMMABILITY, DELAMINATION, STABILITY, FILMS
Abstract: A layered double hydroxide-based fire-blocking coating was deposited on the surface of a flexible polyurethane foam using a layer-by-layer method to improve its thermal stability, flame retardancy and smoke suppression properties. The assembly process was carried out by alternately submerging a flexible polyurethane foam into chitosan solution, layered double-hydroxide suspension and alginate solution. Analysis of the cone calorimeter data indicated that all the coated flexible polyurethane foam showed a lower peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), total smoke release (TSR), peak carbon monoxide (CO) level and peak carbon dioxide (CO2) level compared with the control flexible polyurethane foam. Such a significant improvement in flame retardancy and smoke suppression and a decrease in toxic gas release was ascribed to the physical barrier effect of the layer by layer structure. At the same number of layers, a nickel-aluminum layered double-hydroxide-containing coating performs better than a magnesium-aluminum layered double-hydroxide-filled coating with respect to elimination of toxic effluents from FPUFs.

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