Weak acid-strong base type charge-mosaic membrane. I. Carboxylic acid-quaternary amine system

A film prepared from a pentablock copolymer, poly [isoprene-b-styrene-b-isoprene-b-(4-vinylbenzyl)dimethylamine-b-isoprene] (ISIAI), was subjected to chemical modification in three steps: the A block was quaternized, the I block was cross-linked, and the S block was acylated. The threelayer lamellar...

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Bibliographic Details
Published inJournal of membrane science Vol. 43; no. 2; pp. 205 - 216
Main Authors Isono, Yoshinobu, Ito, Hiroshi, Hirahara, Kazuhiro, Fujimoto, Teruo, Miyaki, Yoshiyuki
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.05.1989
Elsevier
Subjects
Applied sciences
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
Polymer industry, paints, wood
Technology of polymers
Quaternization
Crosslinking
Selectivity
Ion exchange membrane
Chemical modification
Lamellar structure
Carboxylic acid
Isoprene copolymer
PH
Influence
Membrane
Block copolymer
Styrene copolymer
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Summary:A film prepared from a pentablock copolymer, poly [isoprene-b-styrene-b-isoprene-b-(4-vinylbenzyl)dimethylamine-b-isoprene] (ISIAI), was subjected to chemical modification in three steps: the A block was quaternized, the I block was cross-linked, and the S block was acylated. The threelayer lamellar structure of the original film was retained even after these processes. The resulting membrane behaved as a charge-mosaic membrane at higher pH values and as an anion-exchange membrane at lower pH values, the behavior corresponding to the degree of dissociation of the carboxyl group. This weak acid-strong base type charge-mosaic membrane exhibited quite high ion selectivity in comparison with previous strong acid-strong base type charge-mosaic membranes.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(00)85098-X