Bridged Polysilsesquioxanes. Highly Porous Hybrid Organic-Inorganic Materials

摘要

Bridged polysilsesquioxanes are a new family of hybrid organic—inorganic materials prepared by sol-gel chemistry. Trialkoxysilyl groups bridged by organic spacers permit the formation of network polymers capable of forming gels with a wide variety of organic functionalities, including arylene, alkylene, alkenylene, and alkynylene groups. The properties of these materials can be manipulated by changing the reaction or processing conditions to afford high surface area aerogels and xerogels or nonporous polymers. The capability for molecular engineering based on selection of the organic spacer distinguishes bridged polysilsesquioxanes from other sol—gel-processed materials.