Ammonium Polyphosphate Fire Retardance in HIPS: The Effect of 2-Methyl-1,2-oxaphospholan-5-one 2-Oxide

Abstract

A mixture of ammonium polyphosphate and 2-methyl-1,2- oxaphospholan-5-one 2-oxide exhibits a synergistic fire-retardant effect in high-impact polystyrene (HIPS), as measured by the oxygen index and UL94 vertical burning test. Mechanistic studies carried out by means of TGA, FT-IR, and GC/MS revealed that the condensed-phase activity of the additives resulted in the formation of a polyphosphoric acid and probable polyphosphazene-type structures is likely to account for the flame retardation. In addition, reaction between the additives and polymer alters the composition of the pyrolysis products compared to those of neat HIPS.

Keywords

flame retardancy synergistic effect 2-methyl-1,2-oxaphospho-lan-5-one 2-oxide high-impact polystyrene thermogravimetry FT-IR GC/MS

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