Abstract: The flame retardant abilities of zinc, magnesium, and aluminum salts of β(Nphenyl carboxamide) ethylmethylphosphinate on PBT were compared. It showed that the aluminum salt \[Al(CEMP)\] was better than other two. When the loading of Al(CEMP) was 20 wt %, limited oxygen index of 39.5 % and UL 94 V0 were obtained. TG analysis indicated that Al(CEMP) reduced the thermal decomposition rate and increased the char forming of PBT. FTIR showed that the residue containing phosphorus and carbonrich species, which implies that Al(CEMP) acted in condensed phase.

Key words: application, metal salt of phosphinates, poly (butyl glycol terephthalate), flame retardant, nitrogenphosphorus synergism