High Yield Synthesis of Diamino-Substituted Silsesquioxane Building Blocks
AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE SPACE AND MISSILE PROPULSION DIV/PROPULSION MATERIALS APPLICATIONS BRANCH
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Polyhedral oligomeric silsesquioxane POSS materials are monodisperse oligomers of RSiO1.5n that have found application as property enhancers in many thermoset and thermoplastic systems. However, there are not many high-yield scalable syntheses available for producing POSS diamines suitable for incorporation into high-temperature materials. High-yield scalable syntheses were designed and implemented to produce a family of phenylPOSS derivatives containing two aniline groups. These amino functionalities can be either meta, meta- or para, para- on the aromatic groups. The POSS groups can be either pendent to the amino groups or else in chain. When these POSS are mixed with other diamines similar to ODA they are easily copolymerized with dianhydrides from the PMDA family to make a variety of polyimides. Exploration of the properties of such polyimides and oligiomides is underway with the goal to delineate the effect of the stereochemistry of the POSS on the properties of the polymer.
- Inorganic Chemistry
- Polymer Chemistry