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134 0 |
SM ISO690:2012 GUTSANU, Vasile, LUCA, Cornelia, TURTA, Constantin, NEAGU, Violeta, SHOFRANSKY, Valentin, CHERDIVARENCO, Mihail, SIMIONESCU, Bogdan. Ionic polymers. III. Sorption of Fe(III) ions on new crosslinked ionic polymers based on 4-vinylpyridine: Divinylbenzene copolymers. In: Journal of Applied Polymer Science, 1996, vol. 59, pp. 1371-1377. ISSN 0021-8995. DOI: https://doi.org/10.1002/(SICI)1097-4628(19960228)59:9<1371::AID-APP4>3.0.CO;2-8 |
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Journal of Applied Polymer Science | |
Volumul 59 / 1996 / ISSN 0021-8995 /ISSNe 1097-4628 | |
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DOI:https://doi.org/10.1002/(SICI)1097-4628(19960228)59:9<1371::AID-APP4>3.0.CO;2-8 | |
Pag. 1371-1377 | |
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Rezumat | |
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 Fe2(SO4)3 solutions was determined photocolorimetrically for both 4-vinyl-pyridine : 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 R4N+[Fe3(SO4)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. |
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Cuvinte-cheie Addition reactions, Chemical bonds, colorimetric analysis, complexation, Copolymers, Crosslinking, infrared spectroscopy, ion exchange, iron, Mössbauer spectroscopy, sorption, Synthesis (chemical) |
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