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 Bronsted 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 Bronsted haloacetic acids were found to initiate polymerization by the corresponding anions without the involvement of protons.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
