Electronic Supplementary Material Aluminum Hydroxide Multilayer Assembly Capable of Extinguishing Flame on Polyurethane Foam Merid Haile, Sandra Fomete, Ilse D. Lopez, Jaime C. Grunlan Table S1 Additional cone calorimeter results for polyurethane foam with and without nanocoatings Uncoated 6 BL PEM 6 BL PEM-ATH Weight gain (%) ATH in coating (%)a - 0 47 14 2 32 3 Time to ignition (s) 31 31 31 Total smoke release (m2 m-2) Carbon monoxide production (kg/kg) Carbon dioxide production (kg/kg) 159 9 217 2 189 22 0.0241 0.0016 0.0250 0.0005 0.0243 0.0024 2.00 0.06 1.87 0.02 1.80 0.04 ATH was stabilized by ultrasonication in the presence of polyacrylic acid (PAA). The presence of PAA stabilizes the ATH particles (Fig. S1). Figure S1 ATH ultrasonicated in pH 4 water and left sitting for 2 h (left) and ATH ultrasonicated in pH 4 solution containing 0.2% polyacrylic acid and left sitting for 2 h (right) 1 Fig. S2 shows TGA (a) and derivative TGA (b) curves for uncoated and coated foam, measured under nitrogen atmosphere. These are very similar to measurements made in an oxidizing atmosphere (Fig. 5), except that foam coated with PEM retains some char residue at high temperature under nitrogen. Figure S2 Representative weight loss as a function of temperature for coated and uncoated foam (a) and rate of weight loss as a function temperature (b) 2 Fig. S3 shows DSC measurements of coated and uncoated foam. Foam coated with 6 BL PEMATH has an additional lower temperature peak corresponding to the decomposition of ATH. 0 Heat Flow (kW) -2 -4 -6 -8 uncoated control 6BL PEM 6 BL PEM-ATH -10 -12 -14 150 200 250 300 350 400 450 Temperature (°C) Figure S3 Heat flow as a function of temperature for samples measured with DSC Figure S3 shows SEM micrographs of the 6 BL PEM-ATH after cone calorimetry. The porous structure of the foam is somewhat preserved and it appears the residue itself is made up of aggregated alumina particles. Figure S4 SEM micrographs of cone calorimetry char residue of 6 BL PEM-ATH 3