Abstract: The effects of loading of ammonium polyphosphate (APP) and pentaerythritol（PER）, and their weight ratio on the mechanical and retardant properties of ABS were studied. The same effects of toughening agents of polysioxane and MBS were also studied. It showed that APP and PER had excellent synergistic effects on the flame retardancy of ABS. When the weight ratio of APP to PER was 3∶1 and the content of flame retardants exceeded 30 phr, a grade of UL94 V0 was achieved. The content of flame retardants had moderate effect on mechanical properties. When polysioxane or MBS was added to ABS together with 30 phr flame retardant, the impact strength slightly increased and retardant properties were seriously decreased.

Key words: acrylonitrilbutyrenestyrene copolyme, ammonium polyphosphate, pentaerythritol, toughening agent, mechanical property