Langmuir Film of Poly(ethylene oxide) at Air–Water Interface Using Water as Solvent,Industrial & Engineering Chemistry Research

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Langmuir Film of Poly(ethylene oxide) at Air–Water Interface Using Water as Solvent
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-12-13 , DOI: 10.1021/acs.iecr.8b04805
Ramesh S. Bhande ₁ , Lalaso V. Mohite ₂ , Vinay A. Juvekar ₃

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A Langmuir film of poly(ethylene oxide) (PEO) has been prepared at the air–water interface using water as the spreading solvent. Unlike the conventional PEO film (prepared using chloroform as the solvent), which exhibits the highest surface pressure of 10 mN/m, the present film attains a surface pressure of 17.5 mN/m at high apparent polymer loading (35 mg/m²).The π–A isotherm of a film prepared at low PEO loading was observed to be similar in nature to the conventional isotherm of PEO, and the surface pressure attained for the film is 10.5 mN/m at a loading of 1 mg/m². The key step in the preparation of the film is to use a higher initial loading of polymer and multiple compression–expansion cycles to induce aggregation and compaction of PEO molecules in the film. The prepared Langmuir films were characterized in term of surface pressure–surface area isotherms, the hysteresis exhibited by these isotherms, and the static dilatational modulus.

中文翻译：

以水为溶剂的空气-水界面处的聚环氧乙烷Langmuir膜

使用水作为扩散溶剂，在空气-水界面处制备了聚环氧乙烷（PEO）的朗缪尔膜。不同于传统的PEO膜（使用氯仿作为溶剂制备），该膜的最高表面压力为10 mN / m，该膜在高表观聚合物负载量（35 mg / m ²）下达到17.5 mN / m的表面压力。。观察到在低PEO负载下制备的薄膜的π– A等温线在性质上与常规PEO等温线相似，在1 mg / m ²的负载下，薄膜的表面压力为10.5 mN / m。。制备薄膜的关键步骤是使用更高的聚合物初始装载量和多个压缩-膨胀循环来诱导薄膜中PEO分子的聚集和压实。制备的Langmuir薄膜的特征在于表面压力-表面积等温线，这些等温线表现出的滞后性以及静态膨胀模量。

更新日期：2019-02-07

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