文章基本信息

标题：Surface and thermodynamic study of micellization of non ionic surfactant/diblock copolymer system as revealed by surface tension and conductivity
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作者：Rehman N. ; Ullah H. ; Alam S. 等
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2017
卷号：8
期号：4
页码：1161-1167
出版社：University of Mohammed Premier Oujda
摘要：Surface physico-chemical and thermodynamic properties of non ionic surfactants (Tween 20 and Tween 80) with diblock copolymer poly (oxyethylene/oxybutylene) (E39B19) at 298 K have been investigated by surface tension and conductivity techniques. The surface tensiometery were used to study the critical micelle concentration (CMC), surface excess concentration (Г), minimum area per molecule (A), free energy of micellization (ΔGm) and free energy of adsorption (ΔGads). From the observed surface properties it was concluded that the process of micellization is spontaneous and exothermic. Conductometry technique was used to determine critical micelle concentration (CMC), degree of ionization (α), degree of counter ion binding (β). The addition of diblock copolymer to the surfactant solutions increase the values of degree of ionization (α), degree of counter ion binding (β). Although it led to decrease in the values of CMC indicating that the process of micellization is more favorable and spontaneous.
关键词：Surface tension; Conductivity; Diblock copolymer; Non ionic surfactants; Thermodynamic parameters