New hybrid polysilane/polysiloxane nanocomposites
- Sandia National Labs., Albuquerque, NM (United States)
- Stanford Univ., CA (United States). Dept. of Chemistry
Polysilanes are saturated organosilicon macromolecules which display polyene-like electronic properties derived from {sigma}-bond delocalization along the catenated silicon backbone. Potential commercial applications of polysilanes include display devices, NLO materials, semiconductors, photoresists and photoconductors. While Wuertz coupling of dichlorosilane monomers is currently the best synthetic route for large scale preparation of high molecular weight polysilanes, drawbacks include using stoichiometric quantities of molten alkali metal, low polymer yields and significant amounts of hazardous waste. These reaction conditions also limit one`s choice of side group to the most robust organic substituents. Titanocene- and zirconocene-catalyzed polymerization of phenylsilane under mild conditions provides an attractive route to oligophenylsilanes with degrees of polymerization approaching 40, making the resulting of oligomers amenable for many electronic applications. While only arylsilanes can be polymerized by this route, the resulting oligophenylsilane can be functionalized by free radical hydrosilation of olefins, carbonyls and imines. Substitution along the polysilane backbone with sol-gel precursors should generate soluble functionalized polymer and ought to yield, after sol-gel polymerization, materials where the chromophore is entrained within a relatively inert siloxane matrix, an attractive strategy for utilizing polysilanes under thermally demanding or photooxidative conditions. Here the authors describe the extension of this approach to include (alkoxysilyl)propyl functionalities as latent sol-gel polymerizable residues, and the preparation of a new class of hybrid organic-inorganic polysilane-siloxane materials, derived from the sol-gel polymerization of functionalized polysilanes 2a-c.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 266607
- Report Number(s):
- SAND-96-1282C; CONF-960807-7; ON: DE96010973; TRN: AHC29616%%3
- Resource Relation:
- Conference: 212. national meeting of the American Chemical Society (ACS), Orlando, FL (United States), 25-30 Aug 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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