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Ionic polymers. III. Sorption of Fe(III) ions on new crosslinked ionic polymers based on 4‐vinylpyridine: Divinylbenzene copolymers
Author(s) -
Gutanu V.,
Luca Cornelia,
Turta C.,
Neagu Violeta,
Sofranschi V.,
Cherdivarenco M.,
Simionescu B. C.
Publication year - 1996
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/(sici)1097-4628(19960228)59:9<1371::aid-app4>3.0.co;2-8
Subject(s) - divinylbenzene , copolymer , polymer chemistry , acrylonitrile , ionic bonding , polymer , nitrile , chemistry , styrene , amide , materials science , inorganic chemistry , ion , organic chemistry
Copolymers of 4‐vinylpyridine : divinylbenzene with various degrees of crosslinking have been obtained as precursors for ionic polymers. To this end, addition reactions of the 4‐vinylpyridine : 8% divinylbenzene copolymer to electrophylic ethylenic compounds, such as acrylamide, acrylonitrile, and methyl vinyl ketone in the presence of HCl have been performed; the resulting ionic polymers contain, besides ammonium quaternary groups, other functional groups such as amide, nitrile, and ketone. The quantitative iron retention from aqueous Fe 2 (SO 4 ) 3 solutions was determined photocolorimetrically for both 4‐vinylpyridine : divinylbenzene copolymers and the synthesized ionic polymers. IR and Mössbauer spectroscopy were used to determine the state of the Fe(III) ions in the tridimensional networks. As expected, in 4‐vinylpyridine : divinylbenzene copolymers, Fe(III) ions are retained by nitrogen atoms‐Fe(III) complexes. The electronic state of metal ions hardly depends on the crosslinking degree. In the ionic polymers, the Fe(III) ions are retained through ionic exchange as the R 4 N + [Fe 3 (SO 4 ) 2 (OH) 6 ] − complex anion. The functional amide, nitrile, and ketone groups, although containing atoms able to form donor‐acceptor bonds, do not take part in the complexation. © 1996 John Wiley & Sons, Inc.