Abstract: The flame retardancy and Smoke Supression of the PS treated with the stannates/DBDPO additives or the systems containing the Sb2O3/DBDPO has been studied. The thermal degradation in air of PS treated with flame retardants has been studied by differential thermal analysis (DTA) and thermogravimetry (TG) from ambient temperature to 800℃. The mechanisms of the flame retardants are studied. The results shows that PS treated with the stannates additives given the highest limiting oxygen index is 27.8 and the lowest smoke density rating is 68.37, which indicate that the flame retardancy and smoke suppression of the treated PS is improved. Fe3+、Co2+、Ni2+ and Cu2+ have changed the thermal degradation course of PS and accelerated to carbide efficiently so as to enhance the flame retardancy and smoke suppression of the materials.

Key words: polystyrene, stannates, flame retardancy, degradation, thermal analysis