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Preparation of porous membranes
Author(s) -
Harper B. G.
Publication year - 1959
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1959.070010109
Subject(s) - membrane , polymer , solvent , materials science , polyethylene glycol , porosity , chemical engineering , ethyl cellulose , dissolution , permeability (electromagnetism) , cellulose , polymer chemistry , synthetic membrane , chemistry , composite material , organic chemistry , biochemistry , engineering
A new method for preparing plastic membranes with very small pores is described. The method involves dissolving two or more film‐forming polymers in a common solvent. A thin layer of the resulting solution is spread on a smooth surface and the solvent is allowed to evaporate. One of the polymers is then extracted from the resulting film with a selective solvent. The selective permeability of ethyl cellulose was altered considerably using polyethylene glycol as the second polymer. The apparatus for determining the permeability of these films is described. Pictures of the membranes at different stages in their preparation are shown. Electron micrographs demonstrating the effect of this treatment on ethyl cellulose are presented.