Incompletely-Condensed Fluoroalkyl Silsesquioxanes and Derivatives: Precursors for Low Surface Energy Materials (Preprint)

摘要

A novel synthetic method was developed for the controlled functionalization of Fluorinated Polyhedral Oligomeric SilSesquioxanes (F-POSS), which are useful as low surface energy materials for superhydrophobic and oleophobic materials. Utilizing triflic acid, open-cage compounds were created and then reacted with a variety of dichlorosilanes to produce functional F-POSS structures possessing alkyl, aryl, and acrylate based moieties. The crystal structure for an endo,endo disilanol F-POSS compound was determined by single crystal X-ray diffraction. The chemical structures were confirmed using multinuclear NMR spectroscopy (1H, 13C, 19F, and 29Si), FT-IR, and combustion analysis. Dynamic contact angle measurements of these compounds were taken with water and hexadecane. These novel structures were found to possess excellent wettingresistant behavior, similar to that of the parent F-POSS compound. They are the first well-defined fluorinated nanobuilding blocks with a controlled level of reactive functionality for the development of new superhydrophobic and oleophobic materials.