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

Abstract

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 CMC_of surfactant in aqueous solution(CMC_w). Because of the lack of CMC_o (CMC_of surfactant in oil phase) in the study on emulsion, it is impossible to explain the function of surfactant in the emulsification completely by CMC_w. And because of the importance of CMC_o is often ignored, the information of CMC_o 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 CMC_o. 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 CMC_w and CMC_o simultaneously. CMC_w and CMC_o could be used to determine the situations of surfactant molecules in the systems correctly. The useful conclusion means that the relationship between CMC_w and CMC_o could be used to evaluate the effectiveness of surfactants in different systems. And the importance of CMC_o in the study of emulsion could be clearly seen.

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

CLC Number:

O647.2
O648

TrendMD:

WANG Hai-Bo, LIU De-Shan . CMC_o of Nonylphenol Polyoxyethylene Ethers in Oil Phases and the Problems Concerned[J]. Chem. J. Chinese Universities, 2003, 24(6): 1126.

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

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