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Modification of cation exchange membrane by grafted poly(4‐vinyl‐ N ‐methylpyridinium‐iodide)
Author(s) -
Shimasaki Kazuhiro,
Ihara Hirofumi,
Mizutani Yukio
Publication year - 1987
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.1987.070340318
Subject(s) - polyelectrolyte , cationic polymerization , polymer chemistry , chemistry , iodide , membrane , divalent , vinyl polymer , styrene , polymer , ion exchange , polymerization , anionic addition polymerization , copolymer , organic chemistry , ion , biochemistry
It is well known that cation exchange membranes, having a very thin layer of a cationic polyelectrolyte on the membrane surface, have preferential permselectivity for monovalent cations in a monovelent‐divalent cations system. We studied the relationship between preferential permselectivity and molecular structure of the cationic polyelectrolyte. Grafted poly(4‐vinyl‐ N ‐methylpyridinium‐iodide) was used and was compared with poly(4‐vinyl‐ N ‐methylpyridiniumiodide). The backbone polymers were poly(styrene‐co‐p‐benzylstyrene) and poly(benzyl), onto which 4‐vinylpyridine was grafted by anionic polymerization and then quaternized with CH 3 I. The grafted poly(4‐vinyl‐ N ‐methylpyridinium‐iodide) is effective in making the cation exchange membrane preferentially permselevtive for Na + ‐ Ca 2+ system and is more preferable than poly(4‐vinyl‐ N ‐methylpyridinium‐iodide) in terms of electric resistance of the membrane. However, the relationship between the molecular structure of the cationic polyelectrolyte and the durability of the preferential permselectivity is not clear.