Abstract: hina
Abstract:Composites of polycarbonate/acrylonitrile-butadiene-styrene copolymer (PC/ABS)，Pc/APS/organic montmorillonitc (OMMT)，and PC/nBS/organic-modified nano-SiO2(SiO2)flame retarded by bisphcnol A di(phosphatc phenyl ester)(BDP) were prepared via extrusion and granulation using a twin-screw extruder. By means of TG，their thermal decomposition kinetic behaviors in nitrogen atmosphere were studied. Before 8 % mass loss, the activation energy of the PC/ABS/BDP/OMMT and PC/ABS/BDP/SiO2 nancomposites was lower than that of PC/ABS/BDP. However the opposite was observed after 8% mass loss. The average activation energy of PC/ABS/BDP/OMMT and PC/ABS/BDP/SiO2 were 139.39 kJ /mol and 144.17 KJ/mol in 5一75 % mass loss, respectively, all greater than that of PC/ABS/BDP(104.87 kJ/mol).It was found that with OMMT or SiO2 added，the thermal dccomposition speed of PC/ABS/BDP decreased and the thermal stability increased，as confirmed by the measurements of TG，limiting oxygen index, and UL94 V flame retardancy.

Key words: polycarbonatc, acrylonitrilc-butadiene-styrene copolymer, bisphcnol A di(phosphatc phenyl