ABSTRACT:In this research, a flame-retardant water-dispersed polyurethane resin was synthesized through incorporating phosphonate groups into the polyurethane structure in the chain-extension step. A phosphorus-containing reactive flame-retardant compound was synthesized for this purpose. First, bis(4-nitrophenyl)phenyl phosphine oxide was synthesized and then converted to bis(4-amino phenyl)-phenyl phosphine oxide (BAPPO) by reducing its nitro groups into amines. The obtained products were characterized by IR, 1 H-NMR, and 31 P-NMR, and the thermal properties of the polymers were determined by DSC analysis. The BAPPO-containing polyurethane showed physical properties that were almost similar to those of phosphorusfree polyurethane and exhibited good flame resistance with a limiting oxygen index value of 27.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.