Influence of the Structure of Comb-shaped Polymer on the Adsorption Between the Polymer and SO_4~(2-) Ions

摘要

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 SO_4~(2-) ions were studied by conductivity loss experiments. The results indicated that the adsorptions were related to both the content of carboxylic acid groups in polymers and the concentration of Na_2SO_4 solution, adsorptive action was formed by the complexation action between the carboxylic acid groups in polymers and SO_4~(2-) ions, having nothing to do with polyether side chain in polymer. Comb-shaped hyper-branched polymers in aqueous solution would form association super-molecular structure, which could be destroyed by Na_2SO_4 solution.