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The layer-by-layer (LbL) technique is adopted for the construction ofmultilayers encompassing chitosan and graphene oxide (GO) platelets capable ofimproving the flame retardant properties open cell PU foams. The LbL assemblyfollows a linear growth regime as evaluated by infrared spectroscopy and yieldsa multilayer structure where GO platelets are embedded within a chitosancontinuous matrix. 3 and 6 bi-layers (BL) can efficiently coat the complex 3Dstructure of the foam and substantially improve its flame retardant properties.3BL only add 10% to the original mass and can suppress the melt dripping duringflammability and reduce both the peak of heat release rate by 54% and the totalsmoke released by 59% in forced combustion tests. Unprecedented among other LbLassemblies employed for FR purposes, the deposition 6BL is capable of slowingdown the release of combustible volatile to the limits of non-ignitability thuspreventing ignition in half of the specimens during cone calorimetry tests.This has been ascribed to the formation of a protective coating where thethermally stable char produced by chitosan serves as a continuous matrixembedding GO platelets, which control volatile release while mechanicallysustaining the PU foam structure.

polymer degradation and stability

Layer-by-Layer Assembly of Efficient Flame Retardant Coatings Based On  High Aspect Ratio Graphene Oxide and Chitosan Capable of Preventing Ignition  of PU Foam