ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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-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 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. © 1996 John Wiley & Sons, Inc.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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