Dialkylenecarbonate-bridged polysilsesquioxanes. Hybrid organic-inorganic sol-gels with a thermally labile bridging group

Douglas A. Loy, James V. Beach, Brigitta M. Baugher, Roger A. Assink, Kenneth J. Shea, Joseph Tran, James H. Small

Research output: Contribution to journalConference article

Abstract

In this paper, we introduce a new approach for altering the properties of bridged polysilsesquioxane xerogels using post-processing modification of the polymeric network. The bridging organic group contains latent functionalities that can be liberated thermally, photochemically, or by chemical means after the gel has been processed to a xerogel. These modifications can produce changes in density, solubility, porosity, and or chemical properties of the material. Since every monomer possesses two latent functional groups, the technique allows for the introduction of high levels of functionality in hybrid organic-inorganic materials. Dialkylenecarbonate-bridged polysilsesquioxane gels were prepared by the sol-gel polymerization of bis(triethoxysilylpropyl)carbonate (1) and bis(triethoxysilylisobutyl)carbonate (2). Thermal treatment of the resulting non-porous xerogels and aerogels at 300-350 °C resulted in quantitative decarboxylation of the dialkylenecarbonate bridging groups to give new hydroxyalkyl and olefinic substituted polysilsesquioxane monolithic xerogels and aerogels that can not be directly prepared through direct sol-gel polymerization of organotrialkoxysilanes.

Original languageEnglish (US)
Pages (from-to)99-104
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume576
StatePublished - Dec 1 1999
EventProceedings of the 1999 MRS Spring Meeting - Symposium DD, 'Organic/Inorganic Hybrid Materials' - San Francisco, CA, USA
Duration: Apr 5 1999Apr 9 1999

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ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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