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三嵌段共聚物临界胶束浓度与分子横截面积测定

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采用双毛细管最大泡压法装置测定了25℃条件下不同浓度非离子表面活性剂聚乙二醇-聚丙二醇-聚乙二醇三嵌段共聚物(PEG-PPG-PEG;Pluronic L-64)对溶液表面张力的影响.采用Origin软件对数据进行处理分析,计算得到其临界胶束浓度(CMC).基于吉布斯(Gibbs)与朗格缪尔(Langmuir)吸附等温式,对溶液表面张力与浓度关系进行一步非线性拟合,计算获得吸附分子的横截面积.该实验扩展了最大泡压法测定表面张力的应用,提高了学生分析处理实验数据的能力.
Determination of the critical micelle concentration and cross section area of triblock copolymer
The effects of different concentrations of non-ionic surfactant triblock copolymer poly(eth-ylene glycol)-poly(propylene glycol)-poly(ethylene glycol)(PEG-PPG-PEG;Pluronic L-64)on the surface tension were measured by double-capillary maximum bubble pressure method.The data were processed and analyzed by Origin software,and the critical micelle concentration(CMC)was calculated.Based on Gibbs and Langmuir isothermal formula,the relationship between surface tension and concentration of solution was processed by one-step nonlinear fitting to obtain the cross-sectional area of adsorbed molecules.The experiment expands the application of the maximum bubble pressure method and improves the ability of students to analyze and process the experiment data.

maximum bubble pressure methodtriblock copolymer poly(ethylene glycol)-poly(propylene glycol)-poly(ethylene glycol)critical micelle concentrationmolecular cross section area

黄斐斐、田福平、戴岳、张艳娟、贺民

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大连理工大学 基础化学实验中心, 辽宁 大连 116024

最大泡压法 聚乙二醇-聚丙二醇-聚乙二醇三嵌段共聚物 临界胶束浓度 分子横截面积

大连理工大学教育教学改革项目一般项目

YB2022029

2024

10.3969/j.issn.1672-4305.2024.02.009

实验室科学
南开大学　中国高等教育学会

实验室科学

影响因子：0.805
ISSN：1672-4305
年,卷(期)：2024.27(2)
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