Arylene- and alkylene-bridged polysilsesquioxanes

James H. Small, Kenneth J. Shea, Douglas A. Loy

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


Bis(triethoxysilyl)arylene monomers 1-5 and the 1,6-bis(trimethoxysilyl)hexylene monomer 6 were hydrolytically condensed under sol-gel conditions using both acid and base catalysts to produce their respective arylene- and alkylene-bridged polysilsesquioxane materials (X-1 through X-6). Polymerization reactions yielded gels within 24 h. One notable exception was the acid-catalyzed polymerization of 2,5-bis(triethoxysilyl)thiophene (X-5-S1) which required approximately 1 month to gel. The gels were processed by extracting with low dielectric solvents or by aqueous extraction. Solid state 13C and 29Si CP MAS-NMR, infrared spectroscopy, and gas sorption porosimetry were measured on the xerogels. The materials were transparent, glass-like xerogels with surface areas as high as 1100 m2/g and porosity primarily confined to a micropore region (< 20 A ̊ diameters). Xerogels prepared using the aqueous extraction had surface areas between 500 and 956 m2/g.

Original languageEnglish (US)
Pages (from-to)234-246
Number of pages13
JournalJournal of Non-Crystalline Solids
Issue number3
StatePublished - Aug 1 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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