Polydopamine has been of great interest in recent years due to its utility for various functional coatings. Unfortunately, traditional deposition methods, such as polymerization from tris(hydroxymethyl)aminomethane [THAM] buffer, require lengthy film formation time. In an effort to overcome this challenge, polydopamine nanospheres were synthesized using a mixed solvent approach and alternately deposited with chitosan via layer-by-layer assembly onto flexible polyurethane foam. This environmentally-benign, multilayer nanocoating results in a 22% decrease in peak heat release rate compared to uncoated polyurethane foam (and eliminates melt dripping), while simultaneously reducing the processing time. This unique processing strategy yields a sustainable flame retardant nanocoating and provides a technological advance for polydopamine utilization.
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© 2021 The Royal Society of Chemistry.