Influence of the PH Value of Comb-Shaped Polymer on the Adsorption between the Polymer and Ca²⁺ Ions

Abstract

Comb-shaped hyper-branched polycarboxylate admixture polymers, both the water-reducing-type JS and slump-retaining-type BT, were prepared, and their adsorption characteristics with Ca2+ions were studied by conductivity loss experiments. The results indicated that, both the water-reducing-type JS and slump-retaining-type BT, would generate certain electrical conductivity loss in CaCl2aqueous solutions, suggesting that there was some close adsorption between the polymer and Ca2+ions, the adsorption was closely related with the pH value of the polymers, the neutral and alkaline samples neutralized by NaOH show an higher adsorption than that non-neutralized. The adsorption was achieved by the strong interaction between carboxylic acid groups in the polymer backbones and Ca2+ions (rather than Cl-ions)

A study of supermolecular polarization of comb-like polycarboxylate admixtures synthesized with polyoxyethylene macromolecules

“…The difference is that PC-4 consists of an acid stock solution without NaOH treatment, while PC-3 is a neutral sample of PC-4 after NaOH treatment. Their detailed preparing methods were shown in references [12][13][14][15].…”