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Citation: Li Wailang, Zhao Sui, Gu Tiren. SURFACE ACTIVITY OF PLURONIC COPOLYMERS ON THE CYCLOHEXANE/WATER INTERFACE AND APPLICABILITY OF THE GIBBS ADSORPTION EQUATION[J]. Chinese Journal of Applied Chemistry, ;1986, 3(4): 65-68. shu

SURFACE ACTIVITY OF PLURONIC COPOLYMERS ON THE CYCLOHEXANE/WATER INTERFACE AND APPLICABILITY OF THE GIBBS ADSORPTION EQUATION

1.
Department of Chemistry, Peking University

Received Date: 13 September 1985
Available Online: 26 November 1985

The interfacial tension γ of cyclohexane/water interface has been determined by sessile drop method as a function of log concentration of PLURONIC copolymers(L61,L64, and F68).The influences of temperatures (10°, 20° and 35℃),etthylene oxide contents in the polymers as well as added salt (25% NaNO₃) on the γ-log C plots have been investigated. The γ-log C plots over the 0.5-1000 ppm range are convex with respect to the log C axis for all three PLURONIC copolymers used in this work.In this respect the trend is opposite to that of low molecular weight surfactants below the CMC.The reason why the Gibbs adsorption equation,at least in its usual form, may not be applied in describing macromolecular solution has been discussed briefly.
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