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Synthesis and characterization of viologen‐containing poly(vinylidene fluoride) redox‐sensitive membranes
Author(s) -
Liu X.,
Neoh K. G.,
Kang E. T.
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1831
Subject(s) - membrane , viologen , polymer chemistry , chemistry , thermogravimetric analysis , redox , polymer , polymerization , permeation , phase inversion , inorganic chemistry , organic chemistry , biochemistry
Thermally induced graft co‐polymerization of 4‐vinylbenzyl chloride (VBC) with ozone‐preactivated poly(vinylidene fluoride) (PVDF) was carried out in N ‐methyl‐2‐pyrrolidone solution to produce VBC‐g‐PVDF co‐polymers. The resulting VBC‐g‐PVDF co‐polymers with different VBC graft concentrations were cast into microfiltration membranes by phase inversion. Viologen moieties were introduced by the di‐quaternization of 4,4′‐bipyridine with the VBC‐g‐PVDF membranes and VBC through a two‐step reaction in ethanol. The viologen‐containing membranes were characterized by x‐ray photoelectron spectroscopy, elemental analysis, and thermogravimetric analysis. Surface morphology was studied by scanning electron microscopy. It was demonstrated that the permeability of the viologen‐containing membrane can be regulated by redox reactions. This technique of fabricating viologen‐containing membranes represents a relatively simple and effective approach for achieving membranes with redox‐sensitive permeation properties. Copyright © 2004 John Wiley & Sons, Ltd.