POLYPHOSPHAZENES WITH ADAMANTYL SIDE-GROUPS

is(adamantylamino-co-trifluoroethoxy)phosphazene], y[bis(adamantyloxy- co-trifluoroethoxy)phosphazene] , and s(adamantylmethoxy-co-trifluoroe thoxy)phosphazene] with different ratios of adamantyl to trifluoroetho xy groups were synthesized by macromolecular substitution. This work. was preceded by model compound studies with cyclophosphazene trimers a nd tetramers. Polymers in which all the side groups were adamantyl uni ts could not be prepared because of the steric restrictions imposed by the side groups. However, the mixed-substituent polymers with trifluo roethoxy cosubstituents were accessible by sequential substitutions on poly(dichlorophosphazene). These reactions were complicated by some d isplacement of adamantyl groups by the second nucleophile-sodium trifl uoro-ethoxide. The molecular and materials properties of the mixed-sub stituent polymers are described.