Organophosphazenes.22 Copolymerization of (Alpha-Methylethenylphenyl) Penta-fluorocyclotriphosphazenes with Styrene and Methyl Methacrylate

摘要

Both 3- and 4- (1-Methylethenylphenyl) pentafluorocyclotriphosphazene (N3P3F5C6H4C(CH3)=DH2) undergo radical copolymerization with styrene and methyl methacrylate. Flame retardant copolymers with up to 66% and 44% phosphazene content were obtained for the styrene and methyl methacrylate systems respectively. Reactivity ratios and Alfrey-Prince parameter for the styrene system show that the major perturbation produced by the phosphazene is a polar sigma electron withdrawing effect. The methyl methacrylate system was found to exhibit significant penultimate effects in its reactivity behavior. The copolymers were characterized using elemental analysis, gel permeation chromatophrphy, membrane osmometry, TGA and DSC.