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Novel ion‐containing reverse osmosis membranes. I. Preparation and selected properties
Author(s) -
Bittencourt E.,
Stannett V.,
Williams J. L.,
Hopfenberg H. B.
Publication year - 1981
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.1981.070260312
Subject(s) - membrane , grafting , reverse osmosis , salt (chemistry) , polymer chemistry , materials science , chemical engineering , vinyl chloride , extraction (chemistry) , absorption of water , ionic bonding , chemistry , ion , copolymer , chromatography , organic chemistry , polymer , composite material , biochemistry , engineering
Grafting and subsequent quaternization of 2‐and 4‐vinylpyridine to poly(vinyl chloride) (PVC) and to poly[3,3‐bis(chloromethyl)oxetane], Penton, films have been exploited to prepare novel ion‐containing membranes. 2‐Vinylpyridine‐grafted “Penton” films are the most attractive system for further study since the PVC grafts were unstable under the requisite extraction conditions. Although the sterically less hindered 4‐vinylpyridine‐grafted films were easier to quaternize, weight gain calculations indicated that complete quaternizations were only achieved with the 2‐vinylpyridine‐grafted films. High ionic concentrations were obtained in the grafted membranes. The mechanical properties of the wet films were measured. Salt absorption studies demonstrated that significant salt exclusion was achieved at relatively high salt concentrations although the grafted films sorbed up to 30 vol % water.