Monday, 23 May 2005 - 11:00 AM
120

This presentation is part of: Inorganic and Organometallic Polymers I

Polycarbosilanes Hybrid Inorganic/Organic Polymers

Leonard V. Interrante, Rensselaer Polytechnic Institute, Troy, NY

Polycarbosilanes, polymers that contain Si and C in their backbone structure, exhibit many of the characteristics of polysiloxanes {(Si-O)n backbone polymers}, in particular, low Tgs and ease of structural modification through reactions involving Si-X groups; however, they also provide some of the more useful features of certain organic polymers, such as high thermal stability in inert atmospheres and resistance to attack by strong base and acids, due to the essentially non-polar character of the Si-C bond and its reduced tendency to undergo depolymerization through backbiting reactions. Moreover, we have found that, unlike the polysiloxanes, one can isolate and employ in synthetically useful nucleophilic substitution reactions, polymers having one or two Si-Cl groups per repeat unit. This talk, which is based on our research on polycarbosilanes over the past ca. 20 years, will provide illustrations of the chemistry and properties of this novel class of polymers. Our efforts to employ polycarbosilanes as precursors to SiC and as a source of low-k dielectric materials will also be described

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