Extreme Heat Shielding of Clay/Chitosan Nanobrick Wall on Flexible Foam

ACS Applied Materials & Interfaces
Simone LazarJaime Grunlan

Abstract

Flexible polyurethane foam (PUF) is widely used in bedding, transportation, and furniture, despite being highly flammable. In an effort to decrease the flammability of the polymer, an environmentally friendly flame retardant coating was deposited on polyurethane foam (PUF) via layer-by-layer assembly. Treated foam was subjected to three different fire scenarios, 10 s torch test, cone calorimetry, and a 900 s burn-through test, to evaluate the thermal shielding behavior of an eight bilayer chitosan/vermiculite clay nanocoating. In each fire scenario, the nanocoating acts as a thermal shield from the flames by successfully protecting the backside of the PUF, whereas the side directly exposed to the flame results in a hollowed nanocoating that maintains the complex three-dimensional porous structure of the foam. Cone calorimetry reveals that the coating reduces the peak heat release rate and total smoke release by 53 and 63%, respectively, whereas a temperature gradient greater than 200 °C is observed across a 2.5 cm thick coated foam sample during the rigorous burn-through fire test. The thermal shielding behavior of this polymer/clay nanocoating makes this system very attractive in improving the fire safety of polyurethane foam ...Continue Reading

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Citations

Sep 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Giulio Malucelli
Apr 17, 2021·ACS Applied Materials & Interfaces·Carolyn T LongJaime C Grunlan
Apr 4, 2020·ACS Applied Materials & Interfaces·Abbas FahamiJaime C Grunlan
Jan 8, 2019·Biomacromolecules·Felix RiehleAndreas Walther

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