Journal
EUROPEAN POLYMER JOURNAL
Volume 41, Issue 9, Pages 2023-2033Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2005.03.010
Keywords
styrene butadiene rubber; flame retardancy; surface protection; in situ ceramization; ammonium polyphosphate; aluminum trihydroxide
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In this paper the effect of aluminum trihydroxide (Al(OH)(3)-ATH) on the surface protection from fire for a styrene butadiene rubber (SBR) provided by ammonium polyphosphate ([NH(4)PO(3)](n)-APP) is studied. The combustion behaviour is studied by means of Cone Calorimetric tests: a maximum fire retardant effect is observed with 10-12 wt.% of APP. ATH, less effective as fire retardant, has been added at 60 wt.% to reach comparable results as measured by cone calorimetry for 12 wt.% APP. Replacement of ATH in the best performing SBR + 12 wt.% of APP shows an antagonistic effect with as little as 1 wt.% of ATH. The combustion behaviour is explained with the mechanism of interaction between SBR, APP and ATH, in which formation of aluminum phosphates negatively affects the surface protection provided by the ultraphosphate surface coating formed on heating APP in SBR. (c) 2005 Elsevier Ltd. All rights reserved.
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