Incompletely condensed fluoroalkyl silsesquioxanes and derivatives: precursors for low surface energy materials |
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Authors: | Ramirez Sean M Diaz Yvonne J Campos Raymond Stone Rebecca L Haddad Timothy S Mabry Joseph M |
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Affiliation: | ERC Inc., Space & Missile Propulsion Division, Edwards Air Force Base, California 93524-7680, USA. |
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Abstract: | 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 superoleophobic 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 ((1)H, (13)C, (19)F, and (29)Si), 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 wetting-resistant behavior, similar to that of the parent F-POSS compound. They are the first well-defined fluorinated nano-building blocks with a controlled level of reactive functionality for the development of new superhydrophobic and superoleophobic materials. |
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