Abstract:

The fire retardants hexakis (allyl 4-hydroxybenzoate) cyclotriphosphazene (HACP) and tri (allyl 4-hydroxybenzoate )-1,3,5-triazine (TATZ) were successfully synthesized to improve the flame retardancy of poly (ethylene terethalate) (PET), and PET/HACP/TATZ composites were prepared by melt-blending method. The flame retardancy, thermal stability, mechanical property and char forming characteristics of the products were investigated by Limiting Oxygen Index (LOI), vertical burning test, micro calorimeter, thermogravimetric analyzer, differential scanning calorimeter and tensile tester. The results suggest that the synergistic flame retardant effect between HACP and TATZ improved the flame retardancy of PET, and also reduced the negative effect on mechanical property of PET. The LOI value improved to 32.4 % and reaches V-0 in the UL 94 test, and the value of heat release rate decreases to 30.9% in comparison with that of pure PET.

Key words: cyclotriphosphazene, triazine, synergustic effect, poly (eyhylene terethalate), flame retardancy