Abstract
Effect of zeolite and organically modified montmorillonite (MMT) clay on flammability of high-impact polystyrene (HIPS) with ammonium polyphosphate (APP) flame retardant was investigated. Composites were prepared by melt blending in a twin-screw extruder, and it was found that zeolite and APP improve fire performance of HIPS with optimal concentration of 4 mass % of zeolite. Samples with MMT/APP and zeolite/APP have similar results of flammability, yet combination MMT/zeolite/APP had no additional improvement of thermal and fire properties. Mechanical properties were degraded with increasing concentration of zeolite, and improvement was visible when only MMT clay was used in combination with APP.
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