Reaction of polyacrylic acid and metal oxides: Infrared spectroscopic kinetic study and solvent effect

Abstract

SYNOPSISIn this work, we performed infrared spectroscopic studies of the reaction of poly(acrylic acid) (PAA) and metal oxides (ZnO, CaO, CuO, Cr 2 O 3 , and Al 2 O 3 ). Factors such as the amount of metal oxide, reaction time, solvents, the kind of metal oxides, and temperature were also evaluated to derive the optimum condition for this reaction. The reactions of Cr 2 O 3 and Al 2 O 3 were far from complete. An extra solvent added to the reaction system could increase the solubility of PAA and metal oxide in the solution so as to completely react. The reactivity of the reaction was increased by using the hydrophilic solvent, particularly H 2 O and CH 3 OH. Moreover, the reaction rate increased when temperature decreased. The reactivity of the reaction was proportional to the pH value of the metal oxide in the aqueous solution.

Surface modification and immobilization in poly(acrylic acid) of Ag/ZnO for photocatalytic degradation of endocrine‐disrupting compounds

“…Analysis of those traces clearly shows that the thermal stability of the PAA matrix is improved by the addition of Ag/ZnO nanoparticles. It was demonstrated that among several composites of PAA‐metal oxides such as ZnO, CaO and CuO, the PAA‐ZnO composite was the most thermally stable . Similar results were obtained for the P(AA‐SA)/ZnO composite containing 11 wt % of ZnO nanoparticles …”

“…Moreover, the modification of their functional groups (‐COOH) could lead to selective sorption matrices . For instance, the chemical interaction between polyacrylates and ZnO has been reported to be preferential . Poly(acrylic acid) (PAA) molecules preferentially adsorb on the nonpolar facet of ZnO forming coordinative bonds between the carboxylic acid groups and Zn‐atoms .…”

Unpredictable Dynamics of Polymeric Reacting Flow by Comparison between Pre- and Post-Reaction Fluid Properties: Hydrodynamics Involving Molecular Diagnosis via ATR–FTIR Spectroscopy

“…Therefore, we expected the band position of the carboxyl group in a low M w compound, such as acetic acid, to be different from the position in a high M w compound, such as PAA. However, in previous studies, although the band positions of the carboxyl group in acetic acid and in PAA in the solid state − were assigned, the carboxyl group in the polymer with an ultrahigh M w in the aqueous solution was not assigned. Therefore, in this study, we conducted ATR-FTIR measurements of two aqueous solutions to clarify the assignment of the carboxyl group.…”

Fabrication of Polycrystalline ZnO Nanotubes from the Electrospinning of Zn2+/Poly(acrylic acid)

“…Other than the original carbonyl stretching at 1705 cm -1 from the electrospun PAA nanofibers (spectrum a), the as-spun Zn 2þ /PAA nanofibers (spectrum b) revealed an additional adsorption peak centered at 1560 cm -1 , corresponding to a carboxylic acid group associated with the metal ion. 35 Thermogravimetric analyses (TGA) of the Zn 2þ /PAA fibers (sample ZA10) were carried out to investigate thermal decomposition as a function of calcination temperature. As shown in Figure 2, the 14% weight loss before 100°C resulted from the evaporation of moisture in the polyanion media.…”