Application of FTIR spectroscopy for structural characterization of ternary poly(acrylic acid)–metal–poly(vinyl pyrrolidone) complexes

Abstract

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 3þ -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 3þ . 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 3þ with PAA-PVP complex and the other is due to the formation of Fe 3þ 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.

Reactive Sintering of Copper Nanoparticles Using Intense Pulsed Light for Printed Electronics

“…All peaks attributed to PVP disappeared following IPL irradiation due to photodegradation and thermal degradation of PVP by the absorption of high-intensity light and the high temperature of the copper nanoparticles. 10,18 To investigate this copper oxide reduction mechanism, two mechanisms were proposed based on the existing literature as described below.…”

High strength poly(vinyl alcohol)/poly(acrylic acid) cross-linked nanofibrous hybrid composites incorporating nanohybrid POSS

“…Weaker bands associated with scissoring and bending vibrations of ACH 2 A and CHACO groups appeared at 1446 cm À1 and 1407 cm À1 , respectively. The bands at 1231 and 1173 cm À1 were attributed to the coupling between in-plane OH bending and CAO stretching of neighboring carboxyl groups [33]. As expected, the presence of typical bands of PVA and PAA were also observed in the resultant PVA/PAA crosslinked composite nanofibers (Fig.…”

One‐Pot Synthesis of Carboxyl‐Functionalized Rare Earth Fluoride Nanocrystals with Monodispersity, Ultrasmall Size and Very Bright Luminescence

“…Figure 3 shows the FTIR spectra of the pure PAA powder and the as-prepared products, respectively. As shown in part a of Figure 3, a strong absorption band at 1720 cm -1 is assigned to the C=O stretching mode of free carboxylic acid groups (-COOH), while weaker bands centered at 1455 and 1415 cm -1 are associated with the scissor and bending vibrations of -CH 2 -and CH-CO groups, [18] respectively. FTIR spectra of the PAA-capped NaCeF 4 :Tb 3+ and NaCeF 4 :Tb 3+ /LaF 3 nanocrystals are shown in Figure 3 (b and c, respectively).…”