支链异构十五烷基间二甲苯磺酸钠溶液表面性质及其溶剂行为  

Surface Properties of Branch-chain Isomers of Pentadecyl m-Xylene Sodium Sulfonates Solution and Solvent Behavior

作　　者：丁伟[1] 宿雅彬[1] 张春辉[1] 高晓宇[1] 李安军[1] 杨洋[1] 于涛[1] 程杰成[1] 

机构地区：[1]大庆石油学院化学化工学院,大庆163318

出　　处：《应用化学》2009年第9期1023-1026,共4页Chinese Journal of Applied Chemistry

基　　金：国家重点基础研究规划"九七三"资助项目(2005cb221300)

摘　　要：合成了4种高纯度十五烷基间二甲苯磺酸钠,测定了在纯水溶液和0.0393mol/L异丙醇溶液中的表面性质。结果表明,随芳基向碳链中间位置的移动,临界胶束浓度(cmc)增大,分子极限占有面积(Amin)增大,标准吸附自由能(ΔG0)变得更负,降低表面张力的效率(pc20)增强,饱和吸附量(Γmax)降低,临界胶束浓度时的表面张力(γcmc)降低,异丙醇使磺酸钠溶液的cmc显著降低。从分子结构的特点探讨了分子中脂肪链支化程度对其表面性能的影响。The surface properties of synthesized pentadecyl m-xylene sodium sulfonates in pure water and 0. 039 3 mol/L isopropanol solution were measured. The measurements indicate that with the moving of the aryl from the terminal to the center of the long alkyl chain, the critical micelle concentration （ cmc ）, the saturated adsorption area Amin and the negative logarithms of surfactant concentrations needed to reduce surface tension efficiency 20 mN/m（ pc20 ） increased. The standard free energy of adsorption （△G^0 ） became more negative, the surface tension at the cmc （γcmc）tame ） and the maximum surface excess at the cmc （Гmax） decreased. With the addition of isopropanol, the cmc decreased. The effects of molecular branched structures on surface properties were explained from the view of molecular structure.

关 键 词：十五烷基芳基磺酸钠 临界胶束浓度 饱和吸附量 表面张力 

分 类 号：O647[理学—物理化学] TQ423.1[理学—化学]