Effect of hydrophobic chains on the aggregation behavior of cationic silicone surfactants in aqueous solution

被引：30
作者：
Tan, Jinglin [1 ]
Zhao, Peijian [1 ]
Ma, Depeng [1 ]
Feng, Shengyu [1 ]
Zhang, Changqiao [1 ]
机构：
[1] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
来源：
COLLOID AND POLYMER SCIENCE | 2013年 / 291卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Cationic silicone surfactants; Heat capacity; Degree of counterion binding; Entropy-driven; Enthalpy-driven; HEAT-CAPACITY CHANGES; IONIC LIQUIDS; MICELLE FORMATION; MICELLIZATION; THERMODYNAMICS; BINDING; WATER;
D O I：
10.1007/s00396-012-2885-6
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Three cationic silicone surfactants, (2-hydroxyethyl)-N,N-dimethyl-3-[tri-(trimethylsiloxy)]silylpropylammonium chloride (Si(4)ACl), (2-hydroxyethyl)-N,N-dimethyl-3-[bis(trimethylsiloxy)methyl]silylpropylammonium chloride (Si(3)ACl), and (2-hydroxyethyl)-N,N-dimethyl-3-[bis(trimethylsilylmethyl)methyl]silylpropyl-ammonium chloride (Si(3)C(2)ACl), with the same headgroups and different hydrophobic groups were synthesized. Their aggregation behavior in aqueous solution was investigated by surface tension and electrical conductivity. The results show that all the three cationic silicone surfactants perform admirable surface activity. Because of the effect of the hydrophobic groups, the critical micelle concentration values increase following the order Si(3)C(2)ACl < Si(4)ACl < Si(3)ACl, and Si(3)C(2)ACl packs more compactly at the air/water interface compared with Si(4)ACl and Si(3)ACl. Electrical conductivity studies show that all the three cationic silicone surfactants have low degree of counterion binding. Thermodynamic parameters (, , and ) of micellization derived from electrical conductivities indicate that the micellization for both Si(3)C(2)AC and Si(3)ACl in aqueous solution is enthalpy-driven, and that for the Si(4)ACl is entropy-driven. For the heat capacities, , values are positive for Si(4)ACl, indicating that there is an attractive interaction between the nitrogen atom of one surfactant molecule and the oxygen atom of another surfactant molecule for Si(4)ACl.
引用
收藏
页码：1487 / 1494
页数：8
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