三元体系羧甲基纤维素钠-乙二醇-水体系中聚离子-抗衡离子相互作用。
Polyion-counterion interactions in sodium carboxymethylcellulose-ethylene glycol-water ternary solutions.
机构信息
Department of Chemistry, Sikkim Manipal Institute of Technology, Majhitar, Sikkim 737 132, India.
出版信息
Carbohydr Polym. 2013 Feb 15;92(2):1546-54. doi: 10.1016/j.carbpol.2012.11.012. Epub 2012 Nov 10.
Polyion-counterion interactions in sodium carboxymethylcellulose-ethylene glycol-water ternary system have been investigated with special reference to their variations with the polyelectrolyte concentration, the medium relative permittivity and the temperature using electrical conductance measurements. The experimental data have been analyzed on the basis of a model for semidilute polyelectrolyte conductivity which takes into account the scaling arguments proposed by Dobrynin et al. Concentration-dependent moderate counterion condensation (24-33%) was observed. Counterion condensation is found to be spontaneous which depends upon the EG-content of the medium and the temperature. A major proportion of the current is transported by the carboxymethylcellulose polyions. The results further demonstrated that the monomer units experience more frictional resistance in solution as the EG-content increases or as the temperature decreases.
已采用电导测量法，针对钠离子羧甲基纤维素-乙二醇-水三元体系中聚离子-抗衡离子相互作用，特别是其随聚电解质浓度、介质相对介电常数和温度的变化情况，进行了研究。实验数据是基于 Dobrynin 等人提出的半浓聚电解质电导率模型进行分析的。观察到浓度依赖性的中等抗衡离子凝聚（24-33%）。发现抗衡离子凝聚是自发的，这取决于介质中的 EG 含量和温度。大部分电流由羧甲基纤维素聚离子传输。结果进一步表明，随着 EG 含量的增加或温度的降低，单体单元在溶液中会经历更大的摩擦阻力。
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