Ionic polymers. III. Sorption of Fe(III) ions on new crosslinked ionic polymers based on 4-vinylpyridine: Divinylbenzene copolymers
✍ Scribed by V. Gutanu; Cornelia Luca; C. Turta; Violeta Neagu; V. Sofranschi; M. Cherdivarenco; B. C. Simionescu
- Book ID
- 102653862
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 509 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
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 4vinylpyridine : 8% divinylbenzene copolymer to electrophylic ethylenic compounds, such as acrylamide, acrylonitrile, and methyl vinyl ketone in the presence of HC1 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 Fe2(S0& solutions was determined photocolorimetrically for both 4-vinylpyridine : divinylbenzene copolymers and the synthesized ionic polymers. IR and Mossbauer spectroscopy were used to determine the state of the Fe(II1) ions in the tridimensional networks. As expected, in 4-vinylpyridine : divinylbenzene copolymers, Fe(II1) ions are retained by nitrogen atoms-Fe(II1) complexes. The electronic state of metal ions hardly depends on the crosslinking degree. In the ionic polymers, the Fe(II1) ions are retained through ionic exchange as the R4N'[Fe3(S04)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.