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- W2029551206 abstract "Abstract The application of electrophilic compounds as initiators for the polymerization of N-silylated phosphoranimines represents a new and rapid method for the synthesis of low to moderate molecular weight polyphosphazenes. Several Brønsted and Lewis acids were studied, and antimony pentachloride was found to be particularly effective. Complete conversion of a phosphoranimine monomer was observed within 2 hours under mild conditions (ca. 100°C) in solution polymerization with SbCl5. Poly[bis(trifluoroethoxy)phosphazenes] of molecular weight M n = 10,000 to 50,000 were obtained with low to moderate polydispersities (M w/M n = 1.2 to 2.5) and were characterized by NMR, IR, GPC, and DSC techniques. Kinetic and mechanistic evidence support SbCl5 as the true initiator, whereas the Brønsted haloacetic acids were found to initiate polymerization by the corresponding anions without the involvement of protons." @default.
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- W2029551206 date "1995-08-01" @default.
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- W2029551206 title "The Conversion of Phosphoranimines to Polyphosphazenes in the Presence of Electrophiles" @default.
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