Alkylated phosphazene oligomers and method of preparation
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsHarry R. Allcock, Paul J. Harris
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Abstract
Alkylated phosphazene oligomers of the general formula (NP(X.sub.2)).sub.n PRH, wherein X represents chlorine or bromine, R represents a linear or branched alkyl, and n represents an integer from 2 to 8, are prepared by reacting, in a nonoxidizing atmosphere, a perhalopolyphosphazene, a Grignard reagent, and a cuprous complex in solution, followed by the addition of a secondary or tertiary alcohol. Polymers useful as high-temperature elastomers, are prepared from the halo-substituted oligomers by heating them at a temperature from about 200.degree. C. to about 300.degree. C., followed by a reaction with an amine, metal alkoxide, or a metal aryloxide at a temperature from 20.degree. to 200.degree. C.
Claims5
A phosphazene oligomer having the formula:
- (NP(X.sub.2)).sub.n NPRH, wherein X represents chlorine or bromine, R represents a linear or branched alkyl, and n represents an integer from 2 to 8.
A method for alkylating phosphazene oligomer which comprises:
- admixing, in a solvent, perchloropolyphosphazene and a cuprous complex in a phosphazene-to-copper mole ratio from about 4:1 to about 8:1 in a nonoxidizing atmosphere;
- adding, while maintaining mixing, a Grignard reagent in a Grignard-to-copper mole ratio from about 24:1 to about 40:1;
- mixing the reactants until a metallo-phosphazene intermediate is formed;
- adding a hindered alcohol to said intermediate while mixing is continued;
- and
- separating the product.
Dependencies are inferred from the claim text.