POLY 489 |
| The utility of many functional materials including organic polymers and inorganic oxides is enhanced significantly by the fact that they can be produced as uniform spherical particles. Bridged polysilsesquioxanes (BPS) have organic and inorganic domains dispersed at the molecular level. This provides an opportunity to modulate bulk properties such as porosity, thermal stability, refractive index, optical clarity, chemical function, hydrophobicity, and dielectric constant. A method for the direct synthesis of uniform spherical organic/inorganic hybrid particles allows for materials with chemical functionality and selectivity, and photochemical and electrochemical activity. We have developed emulsion polymerization methods, where a monomer solution is dispersed in an immiscible medium to afford droplets where sol-gel polymerization takes place. The method produced spherical BPS nano and microparticles. Materials were prepared from 1,1&prime-bis[3-(trimethoxysilyl)propyl]-4,4&prime-bipyridinium iodide. These materials exhibit interesting electrochromic properties. In addition, the polycationic nature of the materials can be utilized to build core-shell architectures.
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Nanoparticles and Microparticles: Synthesis and Applications
6:00 PM-8:00 PM, Tuesday, 12 September 2006 Moscone Center -- Hall D, Poster
Division of Polymer Chemistry |
