Fluoroalkoxyphosphazene Polymers

The properties of fluoroalkoxyphosphazene polymers and copolymers [N=P(OR)2ln (R- = fluoroalkoxy-group) have been described. Condensation of the phosphazenes, (Cl3PNPh)2 and C3N3(N=PCl3)3, with... 

JThe effect of the substituent on the properties of the polyphosphazenes is not fully understood. For instance, [NP(OCH ) ]n and [NP C CH. homopolymers are elastomers (8,29). Synthesis using lithium, in contrast to sodium, salts is claimed to produce rubber-like fluoroalkoxyphosphazene polymers (30). The presence of unreacted chlorine or low molecular weight oligomers can affect the bulk properties (31,32). Studies with phosphazene copolymers both in solution and in the bulk state (29,33-38) indicate a rather complex structure, which points out the need for additional work on the chain structure and morphology of these polymers. 

This increasingly important topic has been reviewed in general, - > and in terms of specific applications of fluoroalkoxyphosphazene polymers. 

Several new fluoroalkoxyphosphazene polymers have been synthesized and the conformational properties of these compounds explored, using the methods described in ref. 121. 

Poly(Fluoroalkoxyphosphazene) Elastomers. When I is substituted with a mixture of trifluoroethoxide and telomer fluoroalkoxides, an elastomer II is obtained having a fluorine content of approximately 55 percent. A small amount of an unsaturated cure site may also be Incorporated into the polymer to promote vulcanization. 

---