Xu Xian, Shao Yu, Wang Weijie, Liao Jianwen, Liu Hao, Zhang Wei, Zhang Wen-Bin, Yang Shuguang
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Center for Advanced Low-Dimension Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, P. R. China.
Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
Langmuir. 2021 Sep 21;37(37):11084-11092. doi: 10.1021/acs.langmuir.1c01777. Epub 2021 Sep 8.
Giant surfactants with different numbers of aryl-trifluorovinyl ether-functionalized polyhedral oligomeric silsesquioxane (FVPOSS) heads and one poly(ethylene oxide) (PEO) tail, (FVPOSS)-PEO, are precisely synthesized. The phase behaviors of (FVPOSS)-PEO 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)-PEO 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.
精确合成了具有不同数量芳基 - 三氟乙烯基醚官能化的多面体低聚倍半硅氧烷（FVPOSS）头部和一条聚环氧乙烷（PEO）尾部的巨型表面活性剂（FVPOSS）-PEO。通过表面压力测量（等温线和滞后实验）以及布鲁斯特角显微镜研究了（FVPOSS）-PEO在气 - 水界面的相行为。随着FVPOSS头部数量的增加，这些巨型表面活性剂的界面行为发生了很大变化。当FVPOSS头部数量从一个增加到两个和三个时，压缩过程中会发生更多的相变。朗缪尔膜形态的演变和压缩 - 膨胀滞后曲线进一步说明了气 - 水界面处的相变。此外，还提出了描述（FVPOSS）-PEO在界面处相变的分子机制。本研究加深了对特殊巨型表面活性剂界面相行为的理解，并为界面处的纳米结构设计和构建提供了知识。
