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化学学报
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化学学报 ›› 1997, Vol. 55 ›› Issue (8): 761-765. 上一篇    下一篇

研究论文

乙酰水杨酸在微乳液中水解动力学研究

郝京诚;汪汉卿;夏瑞;李干佐   

  1. 中国科学院兰州化学物理研究所;山东大学胶体与界面化学国家教委开放实验室
  • 发布日期:1997-08-15

Hydrolysis kinetic study of aspirin in microemulsions

HAO JINGCHENG;WANG HANQING;XIA RUI;LI GANZUO   

  • Published:1997-08-15

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455

被引次数

13 | 4

用紫外分光光度法研究了乙酰水杨酸在十六烷基三甲基溴化铵(CTAB)/正丁醇/25%正辛烷/H2O微乳液体系中水解动力学, 探讨了反应机理。结果表明,微乳液结构和结构转变点对乙酰水杨酸水解有影响。水解速率在油包水(W/O)微乳液结构介质中较大, 且随水含量增加而减小。而水解反应速率转变点发生在微乳液结构由W/O到B. C. 再到O/W转变点处, 认为是水解反应机理不同和界面膜极性改变造成的。

关键词: 紫外分光光度法, 反应机理, 水, 水解, 乙酰水杨酸, 正辛烷, 正丁醇, 动力学研究, 微乳, 溴化十六烷基三甲铵

The hydrolysis kinetics of aspirin in microemulsion system for cetyltrimethyl-ammonium bromide (CTAB)/n-butanol/25% n-octane/water was studied by using UV method, and the mechanism of the hydrolysis was discussed. The results show that the hydrolysis was affected by the structure and the structural transition of microemulsions. The hydrolysis rates are higher in W/O microemulsion media and decrease with the addition of water, they increase with that in B. C., and they decrease with that in O/W. The transition points of the hydrolysis rates occur at the points of the structural transition from W/O to B. C., and B. C. to O/W, and this was considered to be caused by the different hydrolysis mechanism and the change of polarity in interfacial films.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, REACTION MECHANISM, WATER, HYDROLYSIS, ACETYLSALICYLICUM ACID, NORMAL OCTANE, N-BUTANOL, KINETIC STUDY, MICROEMUSION

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