Temperature dependence of the reaction between some metal oxides and polyacrylic acid

Abstract

SynopsisThe temperature dependence of the reaction between some metal oxides and an aqueous solution of polyacrylic acid was investigated using the infrared measurements. The obtained data indicated that the divalent metal oxides MgO, ZnO, and PbO react rapidly with the polyacrylic acid forming carboxylate salts. The bonding between the acid groups and these metals is purely ionic in character. The reactivity between these metals and the carboxylic acid is inversely proportional to the radius of metal ions. The reaction of BizO3, Crz03, and TLz03 is far from complete. However, SiOz reacts slowly with polyacrylic acid at 0°C only. The results provided strong evidences that the rate of reaction between some metal oxides and polyacrylic acid depends on the temperature of reaction, This rate of reaction is enhanced as the temperature is lowered.

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

“…completely react in the composite of PAA -CuO. Rabie et al 6 indicated that the metal's reactivity ceeded 10 min, the reaction had stopped. The reaction's rates of PAA -CuO and PAA -Al 2 O 3 was inversely proportional to the radius of the metal ions.…”

“…Our results contradicted those of Rawere not influenced for varied temperatures. Figure 12 shows the effects of temperature on bie et al 6 As generally known, the reaction is an acid-base reaction. The pH value of the reactant the reactions of PAA -Cr 2 O 3 and PAA -ZnO.…”

“…The interaction depended on the percentages of ZnO content in the powders and of Some polyelectrolyte cements are formed by cercarboxylic acid in the liquids of these cements. tain powdered metal oxides or ion-leachable siliRabie et al 6 studied the temperature differences cates reacting with concentrated aqueous soluin the reaction between metal oxide and polyations of poly(alkenoic acids). These materials crylic acid.…”

Preparation and microstructure of cobalt(III) poly (acrylate) hybrid materials

“…Poly(acrylic acid) shows this behaviour [8]. As mentioned before poly(acrylic acid) and its salts have been known to have useful binding properties for some years; they have used for soil consolidation [1], [2], [11-13,[16], [19], [22], [23], [25], [27][28][29][30][31][32] and as flocculant [24]. The most common poly(alkenoic acid) used in polycarboxylate cements is poly(acrylic acid), PAA.…”

“…These are the attack by the acid on the base, the migration of the liberated ions from the base in the aqueous phase, the ionization of the poly(acid) with consequent unwinding of the polymer chain, the interaction between the charged chains and cations leading to ion binding and gelation, and the hardening phase [3]. The molecular structure of the polyelectrolyte cements has been examined by a number of workers [19], [22], [29], [30], [32] using infrared spectroscopy. Empirical correlations between the carbon-oxygen stretching frequencies of the carboxylate ions and the nature of their coordination have been used [9], [20].…”