Patent ID: 7074256

Claim:
A method of separating a gas from a gas mixture, comprising: contacting a separation membrane with a gas mixture comprising at least one polar gas and at least one nonpolar gas, the separation membrane comprising a polyphosphazene coating in contact with a support, wherein the polyphosphazene coating comprises a polyphosphazene having a glass transition temperature (â€œT g â€) of approximately âˆ’20Â° C. or less and wherein the polyphosphazene has no halogen atoms and no aromatic groups attached to an oxygen atom that is bound to a phosphorus atom of a backbone of the polyphosphazene and allowing at least a portion of the at least one polar gas to permeate and pass through the separation membrane whereby at least a portion of the at least one polar gas is separated from the at least one nonpolar gas of the gas mixture.