Ring-Opening Polymerization and Chemistry of Nonhalogenated Phosphazene Rings

Ring-Opening Polymerization and Chemistry of Nonhalogenated Phosphazene Rings 

So far, discussions of the ROP of cyclic phosphazenes have been limited to halo-genated rings. Yet, there was a desire to develop a simplified route to poly(organophosphazenes) by performing nucleophilic substitution chemistry on the more labile trimer followed by polymerization this had the advantage that, in general, the substitution chemistry would be quicker and easier when performed 

As a study of the inhibition effect of the monodentate ferrocenyl linkage, a trimer was prepared containing both the polymerizable bidentate and monodentate pendant groups [53]. This mixed trimer was polymerized readily at 290 °C 

OR OR OR Schema 4.9 Polymerization scheme for bidentate metallocenyl trimer derivatives. 

Figu re 4.6 Various spirocyclic (1,1-disubstituted) phosphazene trimers (R = —CH2CF3). 

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