pingwei@sjtu.edu.cn ABSTRACT: A novel solid flame retardant poly(3-aminopropyl methylsiloxane bis(3-hydroxyphenyl spirocyclic pentaerythritol bisphosphate)) (PSBPBP) consisted of phosphorus, silicon, and nitrogen was synthesized and characterized by NMR and FTIR. Then PSBPBP was added to a polycarbonate matrix. The flame retardancy and mechanical properties of the PC/PSBPBP system were tested for limiting oxygen index (LOI), UL-94 rating, tensile, and impact strengths. A significant improvement of flame retardancy of the system was observed (increase of LOI up to 31, and UL-94 V0) with an addition of 15 wt% PSBPBP to PC. Raman spectrum and SEM images have proved the formation of dense and intumescent char in the combustion, which acted as an insulator to the transfer of heat and combustible gases.
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