Cross-linking of a novel reactive polymeric intumescent flame retardant to ABS copolymer and its flame retardancy properties,
writer：Ma HY*, Wang J, Fang ZP
keywords：Acrylonitrile-butadiene-styrene copolymer，cross-linking，carbonization chemistry，flammability
source：期刊
specific source：Polym. Degrad. Stab., 2012.9, 97(9): 1596-1605
Issue time：2012年
A reactive polymeric intumescent flame retardant (PDSPB) was synthesized and applied into ABS resin by two methods: direct melt blends of ABS and PDSPB (ABS/PDSPB) and melt cross-linking of PDSPB to ABS (ABS-c-PDSPB). The cross-linking reaction was characterized by FTIR. The thermal stability, flame retardancy, carbonization chemistry, dynamic mechanical properties and flame retardant mechanism were investigated by TGA, dynamic FTIR, SEM, cone calorimetry and DMA. The addition of PDSPB can effectively reduce the flammability including peak heat release rate (PHRR), total heat release (THR) and average mass loss rate (AMLR). The limited oxygen index (LOI) value was also greatly improved. Especially, the cross-linking of PDSPB can significantly improve the ignition time and reduce the total heat release during combustion. Moreover, ABS-c-PDSPB displayed a more obvious intumescent char layer and char weight than that of ABS/PDSPB blends. Furthermore, cross-linking of PDSPB greatly enhanced the thermal stability and considerably delayed the thermal oxidation degradation of ABS. The dynamic mechanical properties were remarkably improved and the plasticization effect was significantly reduced by cross-linking.