化学学报 ›› 2004, Vol. 62 ›› Issue (4): 424-428. 上一篇    下一篇

研究简报

高分辨NMR研究苯乙烯在CTAB微乳液体系中的增溶行为

石元昌1, 吴佑实1, 李干佐2   

  1. 1. 山东大学材料学院, 济南, 250061;
    2. 山东大学胶体与界面化学教育部重点实验室, 济南, 250100
  • 投稿日期:2003-06-17 修回日期:2003-10-18 发布日期:2014-01-26
  • 通讯作者: 石元昌,E-mail:yuanchshi@sina.com E-mail:yuanchshi@sina.com
  • 基金资助:
    教育部科技发展计划重点基金(No.00195)资助项目.

High Resolution NMR Study on Solubilization Behavior of Styrene in CTAB Microemulsion System

SHI Yuan-Chang1, WU You-Shi1, LI Gan-Zuo2   

  1. a College of Materials Science and Engineering, Shandong University, Jinan 250061)(b Key Laboratory for Colloid and Interface Chemistry of State Education Ministry, Shandong University, Jinan 250100
  • Received:2003-06-17 Revised:2003-10-18 Published:2014-01-26

绘制了CTAB/正丁醇/水/苯乙烯构成的微乳液体系的相图,研究了增溶苯乙烯的含量对相态的影响.通过1H NMR的测定,得出苯乙烯分子主要分布于微乳液滴的栅栏层中,而在微乳液滴内核的增溶量较少.同时,空间位阻效应使得苯乙烯分子几乎无法增溶在CT>AB分子的N-CH3 基团附近.通过13C NMR谱的研究发现,苯乙烯分子在栅栏层中的增溶是不均匀的,在CTAB分子的β碳原子附近增溶量最多,增溶物苯乙烯的增溶量沿着CTAB分子的烃链自外向内逐渐减少.正丁醇分子的13C化学位移的变化趋势呈"V"字形,正是因为苯乙烯的加入使得正丁醇分子在微乳液的分散相之间的分配发生了改变.

关键词: 苯乙烯, 微乳液, CTAB, 增溶, HR-NMR

The phase diagrams of CTAB/n-butanol/water/styrene system were constructed with variable amounts of styrene, and the effect of the styrene contents on the microemulsion stability was also studied. The solubilization of styrene in the O/W microemulsion systems was investigated by 1H NMR method. The results showed that the solubilization site was mainly in the palisade layer of the microemulsions and less of styrene was located in the inner core. Meanwhile, due to the steric hindrance effect styrene molecules can be hardly distributed near the N-CH3 group of CTAB. By means of 13C NMR, it was found that the solubilization of styrene in the palisade layer was not uniform, the location of the highest styrene content was around the β-carbon of CTAB, and its content was gradually decreased from the outer to inner along the hydrocarbon chain of CTAB. The tendency of 13C NMR value of n butanol with molar fraction of styrene was like the type of “V”, and it was due to the addition of styrene that may change the partitioning of n-butanol between the microemulsion phases.

Key words: styrene, microemulsion, CTAB, solubilization, HR-NMR