Abstract
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 language | English (US) |
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Pages (from-to) | 234-246 |
Number of pages | 13 |
Journal | Journal of Non-Crystalline Solids |
Volume | 160 |
Issue number | 3 |
DOIs | |
State | Published - Aug 1 1993 |
Externally published | Yes |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry