标题：Influence of the pH of comb-shaped polymer solutions on the adsorption between the polymer and SO4 2- ions
作者：Duan, Guorong ;Huang, Guohong ;Wang, Xin ;Gong, Ying
作者机构：[Duan, Guorong ;Huang, Guohong ;Wang, Xin ;Gong, Ying ] Nanjing Hydraulic Research Institute, Ruidi Engineering and Technology Center, Nanjing, 210024 更多
会议名称：2011 International Conference on Civil Engineering and Transportation, ICCET 2011
会议日期：October 14, 2011 - October 16, 2011
来源：Applied Mechanics and Materials
摘要：Comb-shaped hyper-branched polycarboxylate polymers, both water-reducing-type admixtures (applied in cement, symbol of JS) and slump-retaining-type admixtures (applied in cement, symbol of BT), were prepared, and their adsorption characteristics with SO4 2-ions were studied by conductivity loss experiments. The results indicated that both JS and BT generate electrical conductivity losses in Na 2SO4 aqueous solutions, suggesting that there was some interaction adsorption between the SO4 2-ions and the polymer. The adsorption was closely related to the pH of the sample solutions and occurred due to the strong interactions between the carboxylic acid groups in the polymer backbones and SO4 2-ions (rather than Na+ ions). However, there was an extremely weak electrostatic adsorptive interaction between the SO4 2-ions and the long polyether side-chain. © (2011) Trans Tech Publications.