In order to investigate the structure-property-relationship of different organophosphorus compounds on the flame retardant behavior of flexible polyurethane foam, a series of model compounds were synthesized. Within this series of compounds we systematically varied the substituents of different classes of as well as the classes of compounds keeping the substituent the same.The different classes of compounds we investigated were namely phosphoramidates, phosphates and phosphonates. With several different compounds in hand we prepared different foams with different concentrations of flame retardant subsequently evaluated the flame retardant behavior by limiting oxygen index (LOI), BKZ-VB and UL94-HB test methods.It was found that the phosphonates and analogous phosphoramidates were more effective than corresponding phosphates in rendering FPF flame retardant. Among these phosphoramidates, mono secondary phosphoramidates were shown to have better flame retardant action than mono tertiary and triphosphoramidates. In addition, dimethyl phosphoramidates exhibited better flame retardant efficacy than the corresponding diphenyl derivatives.

Flame retardants for flexible polyurethane foams: Structure-property-relationship studies

243rd National Meeting (2012)

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