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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (05): 379-383. 上一篇    下一篇

研究论文

N-烷基-N-(2-羟乙基)-N,N-二甲基溴化铵与十二烷基硫酸钠复配系统的双水相

王艳玉1，童威1，邵爽2，雷群芳*,1，方文军1，林瑞森1   

  1. (1浙江大学化学系 杭州 310027)
    (2浙江教育学院化学系 杭州 310012)
  • 投稿日期:2009-06-30 修回日期:2009-08-17 发布日期:2010-03-14
  • 通讯作者: 雷群芳 E-mail:qflei@zju.edu.cn

Aqueous Two-phase Systems of N-Alkyl-N-(2-hydroxyethyl)- N,N-dimethylammonium Bromide and Sodium Dodecyl Sulfate Mixtures

Wang Yanyu1 Tong Wei1 Shao Shuang2 Lei Qunfang*,1 Fang Wenjun1 Lin Ruisen1   

  1. (1 Department of Chemistry, Zhejiang University, Hangzhou 310027)
    (2Department of Chemistry, Zhejiang Education Institute, Hangzhou 310012)
  • Received:2009-06-30 Revised:2009-08-17 Published:2010-03-14
  • Contact: Qun-Fang LEI E-mail:qflei@zju.edu.cn

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合成了N-十二烷基-N-(2-羟乙基)-N,N-二甲基溴化铵、N-十四烷基-N-(2-羟乙基)-N,N-二甲基溴化铵和N-十六烷基-N-(2-羟乙基)-N,N-二甲基溴化铵等3个季铵盐阳离子表面活性剂. 研究了它们以及N-十六烷基-N,N,N-三甲基溴化铵(CTAB)与阴离子表面活性剂十二烷基硫酸钠(SDS)复配系统在313.15 K时的双水相行为. 复配系统在两个非常狭窄的区域能形成双水相, 两相区近似以等摩尔线为中心对称分布, 随着阳离子表面活性剂碳链长度的增长, 富含阳离子表面活性剂的双水相区向阴阳离子表面活性剂摩尔比减小的方向稍有移动.

关键词: 双水相, 阴/阳离子表面活性剂, 季铵盐, 十二烷基硫酸钠

Three cationic surfactants, N-dodecyl-N-(2-hydroxyethyl)-N,N-dimethylammonium bromide, N-tetradecyl-N-(2-hydroxyethyl)-N,N-dimethylammonium bromide and N-cetyl-N-(2-hydroxyethyl)-N,N- dimethylammonium bromide have been synthesized. The aqueous two-phase systems of surfactant mixtures from such N-alkyl-N-(2-hydroxyethyl)-N,N-dimethylammonium bromides or N-cetyl-N,N,N-trimethyl- ammonium bromide (CTAB) with sodium dodecyl sulfate (SDS) have been investigated at 313.15 K. The results indicate that two aqueous two-phase regions can be observed in these mixed cationic-anionic surfactant systems. The two regions are nearly symmetric to the equimolar line. With the increase of chain length in the cationic surfactants, the aqueous two-phase regions with abundant cationic surfactants shift slightly to the lower molar ratio of anionic surfactant versus cationic one.

Key words: aqueous two-phase system, cationic/anionic surfactant, quaternary ammonium salt, sodium dodecyl sulfate