Accession Number : ADA603161


Title :   Functionalization of Fluoroalkyl Polyhedral Oligomeric Silsesquioxanes (F-POSS) (Post Print)


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA


Personal Author(s) : Ramirez, Sean M ; Diaz, Yvonne J ; Campos, Raymond ; Haddad, Timothy S ; Mabry, Joseph M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a603161.pdf


Report Date : Aug 2012


Pagination or Media Count : 16


Abstract : Incompletely-condensed fluoroalkyl-functional Polyhedral Oligomeric SilSesquioxanes (F-POSS) have been synthesized via a scaleable three-step synthetic process with an overall yield of 52%. The primary byproduct of each step in the synthesis is the completely-condensed F-POSS starting material, which enables the recycling of the starting materials. The incompletely condensed structures were readily reacted with a variety of functional dichlorosilanes to introduce reactive or unreactive functionality and produce unsymmetrical F-POSS structures. Chemical structures were confirmed by elemental analysis, multinuclear NMR (1H, 13C, 19F, and 29Si), and FT-IR methods. Single crystal X-ray diffraction was used to elucidate the crystal structure of the precursor F-POSS disilanol. The functionalized F-POSS structures were found to possess variable solubility properties, generally superior to those of the closed-cage F-POSS starting material. Dynamic contact angle measurements of these compounds were examined using water and hexadecane as the wetting liquids. Copolymers of poly(methyl methacrylate) containing F-POSS were synthesized from methacrylate F-POSS macromers. These novel structures can be used as building blocks for the development of low surface energy materials.


Descriptors :   *COPOLYMERIZATION , *OLIGOMERS , COPOLYMERS , CRYSTAL STRUCTURE , DIFFRACTION , HEXADECANE , MODULAR CONSTRUCTION , SILANES , SINGLE CRYSTALS , SOLUBILITY , SURFACE ENERGY


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE