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Posttreatment effects on pore size distribution of loeb‐sourirajan‐type modified cellulose acetate ultrathin membranes
Author(s) -
Ohya Haruhiko,
Konuma Hozumi,
Negishi Yoichi
Publication year - 1977
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.1977.070210919
Subject(s) - cellulose acetate , membrane , reverse osmosis , adsorption , chemical engineering , materials science , swelling , radius , polymer chemistry , chromatography , chemistry , composite material , organic chemistry , biochemistry , computer security , computer science , engineering
Abstract The nitrogen gas adsorption isotherms at −195°C on modified cellulose acetate ultrathin membranes were measured, and the surface area of the pores was determined by the method employed by Cranston and Inkley. A relationship between reverse osmosis characteristics and the mean pore radius was correlated, and it was observed that any method (such as longer evaporation period, heat treatment, or reduction of swelling agent) reducing the mean pore radius to below 20–22 Å improves membrane characteristics of reverse osmosis separation significantly.