高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (6): 1126.

• 论文 • 上一篇    下一篇

壬基酚聚氧乙烯醚在油相中的CMCo及相关问题研究

王海波, 刘德山   

  1. 清华大学化工系, 材料科学研究院, 北京 100084
  • 收稿日期:2002-03-11 出版日期:2003-06-24 发布日期:2003-06-24
  • 通讯作者: 刘德山(1941年出生),男,教授,博士生导师.主要从事聚合物合成研究.E-mail:hxx-dce@mail.tsinghua.edu.cn E-mail:hxx-dce@mail.tsinghua.edu.cn

CMC_o of Nonylphenol Polyoxyethylene Ethers in Oil Phases and the Problems Concerned

WANG Hai-Bo, LIU De-Shan   

  1. Department of Chemical Engineering, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2002-03-11 Online:2003-06-24 Published:2003-06-24

摘要: 对壬基酚聚氧乙烯醚在油相中的临界胶束浓度(CMCo)及与之相关的问题进行了研究,并获得了部分CMCo值.对CMCo与表面活性剂自身结构的关系进行分析和数学处理后,发现CMCo与活性物质自身结构间仍为对数关系.同时在对某些具体体系的界面张力随表面活性剂不同而发生的变化进行了详细分析,发现CMCw和CMCo是评价表面活性剂性能的有效工具.

关键词: 临界胶束浓度(CMC), CMCw, CMCo, 对数关系, 表面活性剂, 相溶性

Abstract: Critical micelle concentration (CMC) is a verYUseful parameter in the study of emulsions. And there are some interesting relations between CMC and the molecular structure of surfactant. Although surfactant molecular is composed of hydrophilic part and lipophilic part, the common point of view about CMC is still focused on CMCof surfactant in aqueous solution(CMCw). Because of the lack of CMCo (CMCof surfactant in oil phase) in the study on emulsion, it is impossible to explain the function of surfactant in the emulsification completely by CMCw. And because of the importance of CMCo is often ignored, the information of CMCo is not easily available at present. In this paper, simple method was designed to determine the ranges of CMC in oil phases of some common surfactants. The relationship between CMC in oil phases and the molecular structure of surfactants was also investigated. The solubility of surfactant in oil phase is the key factor influencing CMCo. Through the analysis about the change interface tension between water and oil phases. It was found that the best result of the decrease in the interface tension was caused by the suitable CMCw and CMCo simultaneously. CMCw and CMCo could be used to determine the situations of surfactant molecules in the systems correctly. The useful conclusion means that the relationship between CMCw and CMCo could be used to evaluate the effectiveness of surfactants in different systems. And the importance of CMCo in the study of emulsion could be clearly seen.

Key words: Critical micelle concentration (CMC), Critical micelle concentration in aqueous solution (CMCw), Critical micelle concentration in oil phase (CMCo), Logarithmic ralationship, Surfactant, Miscibility

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