Hydrophobic and Oleophobic Fluoroalkyl Functionalized Silsesquioxane Nanostructures (Preprint)

摘要

Polyhedral oligomeric silsesquioxane (POSS) compounds comprised of a functionalized silicon-oxygen core framework have received much interest as robust nanoscale building blocks for the development of high performance materials. Notable applications include surface modified supports, semiconducting materials, atomic oxygen resistant coatings, and high use temperature composites. A plethora of POSS compounds with the general formula (RSiO1.5)8 can be prepared possessing a rigid, cubic core diameter of 0.3-1.0 nm through either an acid- or base-catalyzed condensation with functionalized organosilane monomers (e.g., RSiCl3 or RSi(OMe)3). Derivitized nanosized POSS silicas can be incorporated into polymers assembling architectures such as, but not limited to blended composites, branched polymers, as well as incompletely condensed cages. Such hybrid organic-inorganic systems show an improvement of polymer properties such as glass transition, mechanical toughness, chemical resistance, ease of processing, fire resistance, and atomic oxygen permeability.