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:
- USDOE
- 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
microporous
polymide
membranes
asymmetric
membrane
exceptional
solvent
resistance
highly
desirable
permeability
disclosed
solution-casting
solution-spinning
process
copolyamic
acid
comprising
condensation
reaction
product
reactants
selected
diamines
dianhydrides
post-treated
imidize
cross-link
useful
uncoated
ultrafiltration
microfiltration
contactor
applications
support
permselective
coating
form
composite
gas
separations
reverse
osmosis
nanofiltration
pervaporation
vapor
permeation
reverse osmosis
porous membrane
composite membrane
reaction product
gas separation
acid comprising
membrane useful
microporous membrane
highly desirable
/210/95/