Solvent-resistant microporous polymide membranes
An asymmetric microporous membrane with exceptional solvent resistance and highly desirable permeability is disclosed. The membrane is made by a solution-casting or solution-spinning process from a copolyamic acid comprising the condensation reaction product in a solvent of at least three reactants selected from certain diamines and dianhydrides and post-treated to imidize and in some cases cross-link the copolyamic acid. The membrane is useful as an uncoated membrane for ultrafiltration, microfiltration, and membrane contactor applications, or may be used as a support for a permselective coating to form a composite membrane useful in gas separations, reverse osmosis, nanofiltration, pervaporation, or vapor permeation.
- Research Organization:
- Bend Research, Inc
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-92ER81420; FG03-91ER81230
- Assignee:
- Bend Research, Inc., Bend, OR (United States)
- Patent Number(s):
- US 5,725,769/A/
- Application Number:
- PAN: 8-503,809
- OSTI ID:
- 597099
- Country of Publication:
- United States
- Language:
- English
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