Abstract
Materials Science Polyurethane foams are widely used in upholstered furniture and mattresses but pose a fire hazard because they can be highly flammable. Flame and heat retardants are used to make these materials safer, but they can have issues regarding cost or toxicity. Fahami et al. show that three common, inexpensive materials can be used to make a flame retardant. Foams were coated with chitosan-stabilized mica and then poly(acrylic acid)-stabilized mica in a layer-by-layer process with repeated cycling to build up thicker coatings to open cell foams. They found that the coated foams resisted dripping when exposed to heat and would self-extinguish during a 10-second torch test. Further, when exposed to a heat test, the coatings reduced the release of volatile components and smoke from the foam. ACS Appl. Mater. Interfaces 12 , 19938 (2020).
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