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Title: Thermal casting process for the preparation of membranes

Abstract

Disclosed is a method for providing anisotropic polymer membrane 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.

Inventors:
;
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
5459417
Application Number:
ON: DE86013689
Assignee:
Dept. of Energy LBNL; ERA-11-004868; EDB-86-136491
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MEMBRANES; PRODUCTION; PMMA; CASTING; POLYMERS; SOLUTIONS; DISPERSIONS; ESTERS; FABRICATION; MIXTURES; ORGANIC COMPOUNDS; ORGANIC POLYMERS; POLYACRYLATES; POLYVINYLS; 360401* - Polymers & Plastics- Preparation & Fabrication- (-1987)

Citation Formats

Caneba, G.T.M., and Soong, D.S. Thermal casting process for the preparation of membranes. United States: N. p., 1985. Web.
Caneba, G.T.M., & Soong, D.S. Thermal casting process for the preparation of membranes. United States.
Caneba, G.T.M., and Soong, D.S. Wed . "Thermal casting process for the preparation of membranes". United States.
@article{osti_5459417,
title = {Thermal casting process for the preparation of membranes},
author = {Caneba, G.T.M. and Soong, D.S.},
abstractNote = {Disclosed is a method for providing anisotropic polymer membrane 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {7}
}