高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (9): 1564.

• 研究简报 • 上一篇    下一篇

小分子有机添加物对胶团催化的影响

阮科, 赵振国, 马季铭   

  1. 北京大学化学与分子工程学院, 北京 100871
  • 收稿日期:2000-05-17 出版日期:2001-09-24 发布日期:2001-09-24
  • 通讯作者: 赵振国(1937年出生),男,教授,主要从事胶体与界面化学研究.E-mail:majm@chem.pku.edu.cn E-mail:majm@chem.pku.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29733110)资助

The Effects of Small Organic Additive on Micellar Catalysis

RUAN Ke, ZHAO Zhen-Guo, MA Ji-Ming   

  1. College of Chemistry and Molecular Engeneering, Peking University, Beijing 100871, China
  • Received:2000-05-17 Online:2001-09-24 Published:2001-09-24

关键词: 胶团催化, 阳离子表面活性剂, 假相离子交换模型

Abstract: The effects of isopropyl alcohol, tert-butyl alcohol, isopentyl alcohol, benzaldehyde on the first order rate constant k1 of the basic hydrolysis reaction of 2,4-dinitrochlorobenzene in the solution of cetyltrimethylammonium bromide(CTAB) are studied. The results show that k1 decreases with increasing the concentration of small organic additive. It was found that the smaller the alcohol solubility in water and the larger the binding constant with the micelles, the faster the reaction rate decreases. The pseudophase ion-exchange model is applied to quantitatively treat the experimental data. The above results are consistent with that obtained from dynamic light scattering, and are interpreted in terms of the change in micellar structure.

Key words: Micellar catalysis, Cationic surfactant, Pseudophase ion exchange model

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