物理化学学报 >> 1997, Vol. 13 >> Issue (07): 593-597.doi: 10.3866/PKU.WHXB19970704

研究论文 上一篇    下一篇

微乳液结构的研究

郝京诚,汪汉卿,葛金环   

  1. 中国科学院兰州化学物理研究所,兰州 730000|山东师范大学化学系,济南 250014
  • 收稿日期:1996-10-28 修回日期:1997-01-21 发布日期:1997-07-15
  • 通讯作者: 汪汉卿

Studies on the Sturctures of Microemulsions

Hao Jing-Cheng,Wang Han-Qing,Ge Jin-Huan   

  1. Lanzhou Institute of Chemical Physics,Academia Sinica,Lanzhou 730000|Department od Chemistry,Shandong Normal University,Jinan 250014
  • Received:1996-10-28 Revised:1997-01-21 Published:1997-07-15
  • Contact: Wang Han-Qing

摘要:

测定了十二烷基磺酸钠(As)/正丁醇/20%苯乙烯/水体系的相平衡. 用冷冻刻蚀、ESR、FT-IR研究了上述体系微乳液的结构. 研究表明,苯乙烯含量恒定时(20%),随着体系中水含量增加,电导确定的双连续结构的徽乳液经历着从油包水(W/O)到双连续(BC)再到水包油(O/W)变化.FT-IR测定表明,W/O微乳液较O/W微乳液的OH伸缩振动和弯曲振动频率有显著减小,说明W/O微乳液中氢键缔合要比O/W强得多. ESR测定表明O/W微乳液的旋转相关时间高于W/O微乳液,说明O/W微乳液“界面”的微观粘度高于W/O微乳液“界面”的微观粘度.

关键词: 十二烷基磺酸钠, ESR, FT-IR, 冷冻刻蚀, 结构

Abstract:

The isothermal phase diagram for the system sodium dodecyle sulfonate/n-butanol/20% styrene/water has been determined at 40 ℃ The freeze fracture electron microscope, ESR, FT-IR have been used for determining the structures of microemulsions. The investigation shows that, with the increase of H2O-content the bicontinuous structural microemulsions determined by conductivity measurement undergo a change from W/O to bicontinuous (BC) and to O/W when the content of styrene is constant (20%). The stretching vibration and the bending vibration frequencies of OH in W/O microemulsions are less than those in O/W microemulsions, which indicates that the association strength of the hydrogen bonds in W/O microemulsions are much stronger than those in O/W microemulsions. The correlation times, τc, in O/W microemulsions, are longer than that in W/O microemulsions, indicating that the microviscosity in O/W microemulsion interface is higher than that in W/O microemulsion interface.

Key words: Sodium dodecyle sulfonate, ESR, FT-IR, Freeze fracture electron microscope, Structures