Comparison of bridged polysilsesquioxane xerogels prepared from methoxy-, ethoxy-, and propoxy-silyl monomers
Conference
·
OSTI ID:370635
- Sandia National Laboratories, Albuquerque, NM (United States)
Hydrocarbon-bridged polysilsesquioxanes are prepared by the sol-gel polymerization of monomers with more than one trialkoxysilyl groups attached directly to the bridging group by Si-C bonds. While the effects of varying the length of the bridging group (length, rigidity, etc.), monomer concentration, and type of catalyst have been studied, the effect of different alkoxy ligands on the silicon atoms has not been investigated. For this study, 1, 6-bis(triethoxysilyl)hexane 1, 1,6-bis(trimethoxysilyl)hexane 2, and 1,6-bis(tripropoxysilyl)hexane 3 were polymerized under acidic and basic conditions in ethanol, methanol, and n-propanol respectively as well as tetrahydrofuran (THF). The resulting gels were processed to afford xerogels that were characterized by SEM, solid state {sup 13}C and {sup 29}Si Cross Polarization Magic Angle Spinning (CP MAS) NMR spectroscopy, nitrogen and CO{sub 2} sorption porosimetry.
- OSTI ID:
- 370635
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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