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Application of FTIR spectroscopy for structural characterization of ternary poly(acrylic acid)–metal–poly(vinyl pyrrolidone) complexes
Author(s) -
Moharram M. A.,
Khafagi M. G.
Publication year - 2007
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/app.25703
Subject(s) - ternary operation , fourier transform infrared spectroscopy , polyelectrolyte , metal , acrylic acid , polymer chemistry , infrared spectroscopy , metal ions in aqueous solution , electrolyte , 2 pyrrolidone , absorption spectroscopy , inorganic chemistry , chemistry , polymer , divalent , materials science , chemical engineering , copolymer , organic chemistry , physics , electrode , quantum mechanics , computer science , engineering , programming language
The FTIR spectroscopic technique was used in the study of ternary polymer–metal complexes containing two polyelectrolytes of opposite charge and metal ions. The structure of the ternary (PAA‐Fe 3+ ‐PVP) complexes was examined by following the changes in their infrared spectra. It was found that the shapes of the absorption bands of the resultant compounds are influenced by the presence of Fe 3+ . According to this result it was suggested that two types of structure which differ in the composition are formed, one of which results from the coordination of Fe 3+ with PAA‐PVP complex and the other is due to the formation of Fe 3+ polycarboxylate. Comparison between the spectrum of PAA‐PVP complex and those of the compounds resulted from the reaction between the two opposite charged electrolytes, PAA and PVP and each of the divalent metal chlorides NiCl 2 , CoCl 2 , CuCl 2 , and ZnCl 2 ) led to the conclusion that a reaction took place between the divalent transition metal chlorides and the extent of reaction depends on the nature of metal ions and PAA‐PVP complex. The FTIR spectra of the precipitate resulted from the mixtures of PAA‐PVP and Ni(NO 3 ) 2 or Sr(NO 3 ) 2 were investigated. It was noted that the addition of Ni(NO 3 ) 2 or Sr(NO 3 ) 2 to the mixture of the electrolytes of PAA and PVP provoked appreciable changes in the characteristic spectral features of the complex resulting from the interaction of the metal ions with the polymer–polymer complex. The FTIR spectra of the precipitate resulted from the reaction between CeCl 3 , ErCl 3 , and LaCl 3 were also investigated. It was concluded that a reaction took place between the rare earth metals and the PPC. This means that ternary polymer–metal–polymer complexes were formed. The extent of changes in the spectral features differs from metal to metal according to the nature of metal ions. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci, 2007