Abstract: A series of polyaluminosiloxane flame retardants was synthesized through cohydrolysis condensation reaction with varied R/Si and Ph/Me ratios. The influence of the polyaluminosiloxane on the mechanical properties and Vicat softening temperature of PC was investigated. It indicated that the addition of the polyaluminosiloxane had less effect on the flexural strength of the PC, and improved both the tensile strength and the notch impact strength of the PC. Especially, when 5 % polyaluminosiloxane was added to the PC, the notch impact strength of the PC was increased by 31 %. The Vicat softening temperature of the PC was also improved when 8 % or less polyaluminosiloxane was added.

Key words: polyaluminosiloxane, polycarbonate, flame retardant, mechanical properties