Giant surfactants with different numbers of aryl-trifluorovinyl ether-functionalized polyhedral oligomeric silsesquioxane (FVPOSS) heads and one poly(ethylene oxide) (PEO) tail, (FVPOSS)_n–PEO₂₂₇, are precisely synthesized. The phase behaviors of (FVPOSS)_n–PEO₂₂₇ at the air–water interface were investigated through surface pressure measurements (isotherm and hysteresis experiments) and the Brewster angle microscopy. Upon increasing the number of FVPOSS heads, the interfacial behaviors of these giant surfactants greatly change. More phase transitions occur during the compression as the number of FVPOSS heads increased from one to two and three. The evolution of morphologies of Langmuir films and compression–expansion hysteresis curves further illustrate phase transitions at the air–water interface. Furthermore, molecular mechanisms to describe phase transitions of (FVPOSS)_n–PEO₂₂₇ at the interface are put forward. This study deepens the understanding of interfacial phase behaviors of special giant surfactants and provides knowledge of nanostructure design and construction at the interface.

中文翻译：

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具有不同数量的氟化多面体低聚倍半硅氧烷“头”和一个聚（环氧乙烷）“尾”的巨型表面活性剂在空气-水界面处的相行为

精确合成了具有不同数量的芳基三氟乙烯基醚官能化多面体低聚倍半硅氧烷 (FVPOSS) 头和一个聚环氧乙烷 (PEO) 尾 (FVPOSS) _n –PEO _{227 的}巨型表面活性剂。(FVPOSS) _n –PEO ₂₂₇的相行为通过表面压力测量（等温线和滞后实验）和布鲁斯特角显微镜研究了空气 - 水界面处的 。随着 FVPOSS 头数量的增加，这些巨大的表面活性剂的界面行为发生了很大的变化。随着 FVPOSS 头的数量从 1 增加到 2 和 3，在压缩过程中会发生更多的相变。Langmuir 薄膜形貌的演变和压缩-膨胀滞后曲线进一步说明了空气-水界面的相变。此外，描述 (FVPOSS) _n –PEO ₂₂₇相变的分子机制在界面上都提出了。这项研究加深了对特殊巨型表面活性剂界面相行为的理解，并提供了界面处纳米结构设计和构建的知识。