Abstract:

Acrylonitrile?butadiene?styrene copolymer （ABS） was melt blended with aluminum diethylphosphinate （ADP） as a main flame retardant， ammonium polyphosphate aluminum diethylphosphinat （APP） as an auxiliary flame retardant. The resultant compounds achieved good flame?retardant performance and smoke suppression. Based on the analysis results obtained from the ultimate oxygen index， smoke density， cone calorimetry， scanning electron microscopy， and differential scanning calorimetry， the compounds gained an increase in limited oxygen index by 29 vol% at a ABS/ADP/APP mass ratio of 100∶16∶4. Their smoke density decreased down to 68.5， but their fire potential index increased to 0.215 s / （kW·m^-2）. During the combustion process， the compounds decomposed to produce phosphorus oxygen free radicals， inhibiting the chain reaction of the matrix combustion. This resulted in the formation of a huge number of small cavities as well as the expanded and loose carbon layers on the surface of the compounds， generating a good synergetic effect between the gas?phase and condensed?phase flame retardants.

Key words: acrylonitrile?butadiene?styrene copolymer, aluminum diethylphosphinate, ammonium polyphosphate, halogen?free, smoke suppression, flame retardant