Abstract: Polyaluminosiloxane was synthesized through cohydrolysis condensation reaction, which was used as a flame retardant in polycarbonate (PC ). The flame retardant behavior of the system was studied by thermogravimetric analysis, limited oxygen index, and cone calorimeter analysis. It was found that the polyaluminosiloxane could reduce the decomposition rate of the PC and increase the amount of degradation residue during combustion. Adding 5 mass % of polyaluminosiloxane into PC, the limited oxygen index of the PC increased from 25.5 % to 29.4 %, and the fire performance index of the PC increased by 2.5 times. Moreover, the addition of polyaluminosiloxane significantly decreased the heat release rate and the emission of CO, CO2, and smoke during the combustion.

Key words: polycarbonate, polyaluminosiloxane, thermal property, Flame retardancy