中华医学超声杂志

应用化学 ›› 1986, Vol. 0 ›› Issue (4): 65-68.

• 研究简报 • 上一篇    下一篇

PLURONIC共聚物在环己烷/水界面上的活性和Gibbs公式

李外郎, 赵濉, 顾惕人   

  1. 北京大学化学系
  • 收稿日期:1985-09-13 修回日期:1985-11-26 出版日期:1986-08-10 发布日期:1986-08-10
  • 通讯作者: 李外郎

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

Li Wailang, Zhao Sui, Gu Tiren   

  1. Department of Chemistry, Peking University
  • Received:1985-09-13 Revised:1985-11-26 Published:1986-08-10 Online:1986-08-10

PDF

406

被引次数

5

摘要： PLURONIC共聚物是由环氧乙烷(EO)和环氧丙烷(PO)共聚而成的一类二元醇,其通式是HO(C2H4O)a(C3H6O)b(C2H4O)cH,其中b≥15,平均而言,a=c,EO的含量占10—90%。这类化合物一般有较高的表面活性,但形成的膜不甚坚固,因此常用作消泡剂或破乳剂。虽然PLURONIC共聚物水溶液的表面张力已有一些工作,但关于油/水界面张力则尚未见充分研究、本文测定了10°、20°和35℃时环己烷/水溶液的界面张力与三种PLURONIC共聚物的浓度的关系,以及添加硝酸钠的影响,以期对这类化合物在油/水界面上的活性作出初步评价。

Abstract: 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 descri-bing macromolecular solution has been discussed briefly.

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