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Further Studies on Fire Retardant Polystyrene by Friedel-Crafts Chemistry.


pdf icon Further Studies on Fire Retardant Polystyrene by Friedel-Crafts Chemistry. (592 K)
Wang, Z.; Jiang, D. D.; Wilkie, C. A.; Gilman, J. W.

Polymer Degradation and Stability, Vol. 66, 373-378, 1999.

Keywords:

polystyrene; fire retardants; calorimetry; crosslinking; phosphate; styrene; cone calorimeters

Abstract:

The combination of a copolymer of 4-vinylbenzyl alcohol and styrene with 2-ethylhexyldiphenylphosphate (DPP) and with metal chlorides has been studied by TGA, radiative gasification. Cone calorimetry, and oxygen index measurements. Evidence is presented in support of a cross-linking reaction with the additives and the copolymer which proceeds through a Friedel-Crafts mechanism. This approach reduces the peak heat release rate (HRR) by 60% as measured in the Cone Calorimeter. There is a significant reduction in the mass loss rate during the thermal degradation and evidence of char formation is observed in the radiative gasification experiments.