| abstract |
A process for the preparation of polyphosphazenes is provided that includes the cationic solution polymerization reaction of a phosphoranimine, using a main group or transition metal halide, or other appropriate halide salt, including a linear phosphazene salt of any chain length, or a preformed non-phosphazene polymer containing a main or transition metal chloride, as an initiator. In a preferred embodiment, triarmed-star polyphosphazenes having the formula N{RN(H)R' 2 P--(N═PR' 2 ) n } 3 are prepared via this method. Also, a methods for synthesis of the monomer Cl 3 P═NSiMe 3 and cyclic trimer N 3 P 3 X 6 from the reactants N(SiR 3 ) 3 and PX 5 are also described. |