Journal
POLYMER DEGRADATION AND STABILITY
Volume 93, Issue 3, Pages 714-722Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2007.12.008
Keywords
polypropylene; fire retardant; halogen; phosphorus; N-alkoxy HALS; UL 94
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This work studies the effect of an N-alkoxy HALS on the thermal decomposition of a brominated phosphate ester fire retardant. We have monitored the fate of the fire retardant in the presence of the N-alkoxy HALS during thermal decomposition using TGA, FTIR, TD-GC-MS, NMR and ESR methods. We have shown that the two additives interact in the condensed phase at temperatures below the onset of polymer decomposition to produce 1,3-dibromo-2,2-bis(bromomethyl)-propane as the main decomposition product. It is believed that this molecule is the key to the fire retardant action of the brominated phosphate ester because it readily decomposes to the effective gas phase flame inhibiting agent, HBr. (C) 2007 Elsevier Ltd. All rights reserved.
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