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AssigneeUop LLC
InventorsChunqing Liu, Man-Wing Tang, Raisa Serbayeva, Lubo Zhou
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In the present invention high performance cross-linked polybenzoxazole and polybenzothiazole polymer membranes and methods for making and using these membranes have been developed. The cross-linked polybenzoxazole and polybenzothiazole polymer membranes are prepared by: 1) first synthesizing polyimide polymers comprising pendent functional groups (e.g., —OH or —SH) ortho to the heterocyclic imide nitrogen and cross-linkable functional groups in the polymer backbone; 2) fabricating polyimide membranes from these polymers; 3) converting the polyimide membranes to polybenzoxazole or polybenzothiazole membranes by heating under inert atmosphere such as nitrogen or vacuum; and 4) finally converting the membranes to high performance cross-linked polybenzoxazole or polybenzothiazole membranes by a crosslinking treatment, preferably UV radiation. The membranes can be fabricated into any convenient geometry. The high performance cross-linked polybenzoxazole and polybenzothiazole polymer membranes of the present invention are suitable for a variety of liquid, gas, and vapor separations.
Crosslinked polybenzoxazole and polybenzothiazole polymer membranes prepared from cross-linkable polyimide polymers comprising cross-linkable functional groups found in a backbone of said cross-linkable polyimide polymers and pendent —OH or —SH groups ortho to a heterocyclic imide nitrogen wherein said cross- linkable polyimide polymers are first converted to a polybenzoxazole or a polybenzothiazole polymer by thermal conversion and then said polybenzoxazole or said polybenzothiazole polymer is subjected to a crosslinking treatment.
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A method for making cross-linked polybenzoxazole and polybenzothiazole polymer membranes comprising:
Dependencies are inferred from the claim text.