Solvent-resistant microporous polymide membranes
- Bend, OR
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. (Bend, OR)
- Sponsoring Organization:
- United States Department of Energy
- DOE Contract Number:
- FG03-92ER81420; FG03-91ER81230
- Assignee:
- Bend Research, Inc. (Bend, OR)
- Patent Number(s):
- US 5725769
- OSTI ID:
- 871407
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
acid
acid comprising
applications
asymmetric
coating
composite
composite membrane
comprising
condensation
contactor
copolyamic
cross-link
desirable
diamines
dianhydrides
disclosed
exceptional
form
gas
gas separation
highly
highly desirable
imidize
membrane
membrane useful
membranes
microfiltration
microporous
microporous membrane
nanofiltration
osmosis
permeability
permeation
permselective
pervaporation
polymide
porous membrane
post-treated
process
product
reactants
reaction
reaction product
resistance
reverse
reverse osmosis
selected
separations
solution-casting
solution-spinning
solvent
solvent-resistant
support
ultrafiltration
uncoated
useful
vapor