Fire retardancy mechanisms of arylphosphates in polycarbonate (PC) and PC/acrylonitrile-butadiene-styrene |
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Authors: | Perret Birgit Pawlowski Kristin H Schartel Bernhard |
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Institution: | (1) BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany; |
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Abstract: | The pyrolysis of polycarbonate (PC) and PC/acrylonitrile-butadiene-styrene (PC/ABS) with and without arylphosphates (triphenylphosphate
TPP, resorcinol-bis(diphenyl phosphate) RDP and bisphenol A bis(diphenyl phosphate) BDP) is investigated by thermal analysis
as key to understanding the flame retardancy mechanisms and corresponding structure–property relationships. The correspondence
between the decomposition temperature range of arylphosphates and PC is pointed out as prerequisite for the occurrence of
the reaction between arylphosphate and structures that are typical for the beginning of PC decomposition. Resulting cross-linking
enhances charring in the condensed phase and competes with the alternative release of phosphate in the gas phase and thus
flame inhibition. Flame inhibition was identified as the main flame retardancy mechanism. The additional condensed phase mechanisms
optimise the performance. |
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