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An interpolymer anionic composite reverse osmosis membrane derived from poly(vinyl alcohol) and poly(styrene sulfonic acid)
Author(s) -
Koyama Kiyoshi,
Okada Minoru,
Nishimura Masato
Publication year - 1982
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.1982.070270804
Subject(s) - vinyl alcohol , membrane , sulfonic acid , materials science , polymer chemistry , styrene , reverse osmosis , aqueous solution , chemical engineering , solvent , curing (chemistry) , pervaporation , polymer , chemistry , permeation , organic chemistry , composite material , copolymer , biochemistry , engineering
An interpolymer anionic composite membrane for reverse osmosis was prepared from poly(vinyl alcohol) and poly(styrene sulfonic acid). The effects of composition of a casting solution, heat‐curing periods, and casting thickness on the reverse osmosis performance of resulted membranes have been examined. A mixture of water and ethyl alcohol (12/7, wt %) was found to be a proper solvent for casting an interpolymer membrane on the supporter. The composite membrane was formed by casting the polymer solution in ultrathin film on a microporous polypropylene supporter, evaporating the solvent, and heat‐curing at 120°C for a proper period. the optimum composition of a casting solution was as follows: wt % of poly(vinyl alcohol)/poly(styrene sulfonic acid)/solvent was 3/2/95. The membrane heat‐cured at 120°C for 2 h has a good performance for reverse osmosis, viz., water flux of 9.1–28.4 L/m 2 .h at salt rejection level of 88.1–93.4% under applied pressure of 80 kg/cm 2 with 0.5% NaCl aqueous solution. The formation mechanism of a water‐insoluble membrane was discussed.