Thermal casting process for the preparation of anisotropic membranes and the resultant membrane
- Albany, CA
A method for providing anisotropic polymer membranes from a binary polymer/solvent solution using a thermal inversion process. A homogeneous binary solution is cast onto a support and cooled in such a way as to provide a differential in cooling rate across the thickness of the resulting membrane sheet. Isotropic or anisotropic structures of selected porosities can be produced, depending on the initial concentration of polymer in the selected solvent and on the extent of the differential in cooling rate. This differential results in a corresponding gradation in pore size. The method may be modified to provide a working skin by applying a rapid, high-temperature pulse to redissolve a predetermined thickness of the membrane at one of its faces and then freezing the entire structure.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AP03-84SF15389
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4659470
- OSTI ID:
- 866222
- Country of Publication:
- United States
- Language:
- English
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Thermal casting process for the preparation of membranes
Thermal casting process for the preparation of anisotropic membranes and the resultant membrane
Related Subjects
casting
process
preparation
anisotropic
membranes
resultant
membrane
method
providing
polymer
binary
solvent
solution
inversion
homogeneous
cast
support
cooled
provide
differential
cooling
rate
thickness
resulting
sheet
isotropic
structures
selected
porosities
produced
depending
initial
concentration
extent
results
corresponding
gradation
pore
size
modified
applying
rapid
high-temperature
pulse
redissolve
predetermined
freezing
entire
structure
predetermined thickness
cooling rate
pore size
casting process
resulting membrane
binary poly
polymer membrane
polymer membranes
solvent solution
resultant membrane
entire structure
initial concentration
anisotropic membranes
binary solution
inversion process
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