| Fluorpolymer Property Enhancement via Incorporation of Fluorinated Polyhedral Oligomeric Silsesquioxanes (FluoroPOSS) |
12 MAR 2004 |
13 pages |
| Authors:
Joseph M. Mabry; Darrell Marchant; Brent D. Viers; Patrick N. Ruth; Scott Barker; ENGINEERING RESEARCH AND CONSULTING INC(ERC INC) EDWARDS AFB CA
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 | Fluorinated Polyhedral Oligomeric Silsesquioxanes (FluoroPOSS) are the newest class of POSS compounds. These compounds have the highest molecular weights and highest densities of any POSS compounds yet produced. They also have remarkable surface properties, which have been observed in water contact angle measurements. A number of FluoroPOSS compounds have been produced from their respective trifunctional monomers. These FluoroPOSS compounds have been blended into several fluoropolymers, including fluorinated ethylene-propylene (FEP), poly(chlorotrifluoroethylene) ... |
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| POSS is not Just a Sphere: (Living Next Door to a Fluorine Chemist) |
05 MAR 2003 |
17 pages |
| Authors:
Brent D. Viers; Joseph Mabry; Rene L. Gonzalez; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| This document is a report of POSS(Polyhedral Oligomeric Silsesquioxane). |
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| A Reanalysis of Polyhedral Oligomeric Silsesquioxane Ions and Salts |
05 MAR 2003 |
29 pages |
| Authors:
Brent D. Viers; Tim Haddad; Michael T. Bowers; Rusty Blanski; Rene Gonzalez; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Polyhedral Oligomeric Silsesquioxanes (POSS) are of interest because the hydrolysis and condensation of the silane precursors can be controlled to form incompletely condensed "scaffolds" which can then be functionalized (via condensation) with differing moieties. However, conventional wisdom held that isolation of ionized scaffolds was impossible due to the increased reactivity of the ionic siloxy fragments. However, recent results have shown that certain POSS based salts are indeed stable. This talk ... |
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| Organic Polymers Modified with Inorganic Polyhedra |
08 MAY 2002 |
29 pages |
| Authors:
Timothy S. Haddad; Brent D. Viers; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Nanostructured composites of thermoplastics and inorganic clusters have been developed by incorporating polyhedral oligomeric silsesquioxane (POSS) macromers into organic polymers. These hybrid inorganic/organic thermoplastics based on styrenes, acrylics, imides, norbornenes or siloxanes, are reinforced by covalently linking monodisperse inorganic POSS clusters to the polymer backbone. A typical POSS-macromer, R7P(SisO12), is a well-defined octomeric polyhedron containing a single "P" functionality for polymerization and seven "R11 groups to solubilize and compatibilize the ... |
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| Monofunctional Aminophenyl Polyhedral Oligomeric Silsesquioxanes - A model for High Performance Nanocomposite Monomers |
26 MAR 2002 |
24 pages |
| Authors:
Rene I. Gonzalez; Brent D. Viers; Timothy Haddad; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE WEST
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| An aminophenyl functionalized polyhedral silsesquioxane (POSS) was synthesized as a model monofunctional organic-inorganic hybrid monomer. A multistep procedure whereby an incompletely condensed POSS triol scaffold was "corner capped" with phenyltrichlorosilane and then the phenyl moiety was nitrated and subsequently reduced with Zn/HCl to form the desired AMINOPHENYLPOSS (POSS aniline). Mononitration and quantitative reduction to a monoamine was observed. Furthermore, the amine was isolated as the free base, and not as ... |
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| Hybrid Inorganic/Organic Reactive Polymers for Severe Environment Protection |
21 FEB 2002 |
11 pages |
| Authors:
Shawn H. Phillips; Rene I. Gonzalez; Rusty L. Blanski; Brent D. Viers; Gar B. Hoflund; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Leading-edge, fundamental research in polymer technology is often directed towards those applications requiring dramatic improvements in temperature or oxidation resistance. While non-reactive polymers systems are often desired, many benefits can be realized by utilizing inorganic, reactive molecules within the polymer matrix. In such systems, a sacrificial layer of the hybrid polymer is destroyed until passivation occurs. Over the last decade the Air Force Research Laboratory has studied how the incorporation ... |
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| Polyhedral Oligomeric Silsesquioxane (POSS) Styrene Macromers |
20 NOV 2001 |
20 pages |
| Authors:
Timothy S. Haddad; Brent D. Viers; Shawn H. Phillips; ENGINEERING RESEARCH AND CONSULTING INCEDWARDS AFB CA
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| Four polyhedral oligomeric silsesquioxane (POSS) macromers, R7Si8O12Styrene (R = isobutyl, cyclopentyl, cyclohexyl or phenyl) containing a single polymerizable styrene unit were synthesized from the POSS-trisilanols R7Si7O9(OH)3 in high yield and purity. The base-assisted reaction to produce these macromers appears to be general for POSS-trisilanols of this type. However, in some cases it may be necessary to control the rate at which base is present during reaction to prevent unwanted side ... |
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| Basic and Applied Research on Hybrid Organic/Inorganic Materials for Propulsion and Space |
31 OCT 2001 |
26 pages |
| Authors:
Brent D. Viers; Shawn H. Phillips; Timothy S. Haddad; Rusty Blanski; Steve Svcjda; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| Polyhedral Oligomeric Silsesquioxanes Surfactants |
2001 |
3 pages |
| Authors:
Brent D. Viers; Alan Esker; Katie Farmer; ENGINEERING RESEARCH AND CONSULTING INCEDWARDS AFB CA
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| There has been recent interest in using polyhedral oligomeric silsesquioxanes (POSS) as the smallest particles of silica for reinforcement of polymers. These materials are monodisperse, have tailored functionality (including a hydrophobic coating) and should thus act as model nanoparticulate filler. Feher et al have shown that sol-gel condensation into cage compounds can yield two thermodynamically stable main isolates: a fully condensed R8T8 cube and an incompletely condensed R7T4D3(OH)3 trisilanol. (T ... |
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