Cross-linked gas permeable membrane of a cured perfluorinated urethane polymer, and optical gas sensors fabricated therewith
AssigneeOptical Sensors Incorporated
InventorAlan Olstein
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Abstract
An optical sensor is provided for measuring dissolved gases such as O.sub.2 or CO.sub.2 in a fluid sample. The sensor is formulated so as to contain a gas permeable membrane of a cured perfluorinated urethane polymer and, incorporated therein, a gas-sensitive indicator component. Methods for making and using the membrane and sensor are provided as well.
Claims22
A cured perfluorinated urethane polymer prepared by the process which comprises cross-linking a perfluorinated urethane polymer precursor having the structural formula ##STR5## wherein Ar is a monocyclic aromatic moiety and X is a perfluorinated polyether linkage containing approximately 2 to 100 recurring perfluorinated mer units having the structure .paren open-st.CF.sub.2 O.paren close-st., .paren open-st.CF.sub.2 CF.sub.2 O.paren close-st., or combinations thereof, with a cross-linking agent selected from the group consisting of water, diols of the formula HO--R--OH wherein R is alkylene of 1 to 6 carbon atoms, bisphenol A and hexafluorobisphenol A, wherein the cross-linking agent is present such that, it represents on the order of 0.5 to 5 wt. % of the cured perfluorinated urethane polymer.
A cured perfluorinated urethane polymer prepared by the process which comprises cross-linking a perfluorinated urethane polymer precursor having the structural formula ##STR6## wherein Ar is a monocyclic aromatic moiety, X is a perfluorinated polyether linkage containing approximately 2 to 100 recurring perfluorinated mer units having the structure .paren open-st.CF.sub.2 O.paren close-st., .paren open-st.CF.sub.2 CF.sub.2 O.paren close-st., and n is an integer in the range of 0 to 6 inclusive, by treating the precursor with radiation in the presence of a catalytic amount of a photoinitiator.
A cured perfluorinated urethane polymer prepared by the process which comprises cross-linking a perfluorinated urethane polymer precursor having the structural formula ##STR7## Ar is a monocyclic aromatic moiety, X is a perfluorinated polyether linkage containing approximately 2 to 100 recurring perfluorinated mer units having the structure .paren open-st.CF.sub.2 O.paren close-st., .paren open-st.CF.sub.2 CF.sub.2 O.paren close-st., or combinations thereof, and n is an integer in the range of 0 to 6 inclusive, ##STR8## by treating the precursor with radiation in the presence of a cationic photoinitiator.
Dependencies are inferred from the claim text.