Porous materials by design. Plasma oxidation of hydrocarbon templates in polysilsesquioxanes
- Sandia National Laboratories, Albuquerque, NM (United States)
- Univ. of California, Irvine, CA (United States)
Arylene- and alkylene-bridged polysilsesquioxanes were prepared by sol-gel processing of bis (triethoxysilyl)-aryl monomers 1-4 and decyl monomer 5. The arylene polysilsesquioxanes were porous materials with surface areas as high as 830 m{sup 2}/g (BET). Treatment with an inductively coupled oxygen plasma resulted in the near quantitative removal of the arylene bridging groups and a coarsening of the pore structure. Solid state {sup 29}Si NMR was used to confirm the conversion of the sesquioxane silicons (T) to silica (Q). The decylene-bridged polysilsesquinoxane was non-porous materials. Oxygen plasma treatment afforded a silica gel with a surface area of 294 m{sup 2}/g and a mean pore diameter of 46 {angstrom}. The porosity in the silica gel appears to arise entirely from the oxidation of the 1,10-decylene spacer.
- OSTI ID:
- 141585
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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