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A light‐scattering and membrane formation study on concentrated cellulose acetate solutions
Author(s) -
Kunst B.,
Škevin Đ.,
Deželić Gj.,
Pétres J. J.
Publication year - 1976
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.1976.070200517
Subject(s) - membrane , formamide , casting , ultrafiltration (renal) , light scattering , materials science , cellulose acetate , chemical engineering , membrane structure , reverse osmosis , ternary operation , porosity , scattering , chromatography , chemistry , composite material , organic chemistry , optics , biochemistry , physics , computer science , programming language , engineering
An improved explanation of the mechanism of the porous membrane formation with asymmetric structure has been proposed. It emerged from the correlation of the results obtained by the light‐scattering measurements of the ternary membrane casting solutions and by the reverse osmosis and ultrafiltration testing of the asymmetric membranes prepared from these solutions. The results of anisotropic light‐scattering measurements indicated the extent of supermolecular structurization of the casting solution which affected the porous structure formation in the membrane surface region. The variation of the casting solution composition and, particularly, the role of the CA/F ratio, the formamide content, and their influence on the asymmetric membrane properties were investigated and explained using the improved concept of the membrane‐making mechanism.