Porous materials by design. Plasma oxidation of hydrocarbon templates in polysilsesquioxanes

Conference · Tue Dec 31 23:00:00 EST 1991

OSTI ID:7077810

Loy, D A; Buss, R J; Assink, R A ^[1]; Shea, K J; Oviatt, H ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. California Univ., Irvine, CA (United States). Dept. of Chemistry

Arylene- and alkylene-bridged polysilsesquioxanes were prepared by sol-gel processing of bis(triethoxysilyl)-aryl monomers and decyl monomer. 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 polysilsesquioxane was a non-porous material. 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.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 7077810
• Report Number(s): SAND-92-2522C; CONF-930304--1; ON: DE93005372
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601* -- Other Materials-- Preparation & Manufacture
ADSORBENTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
EVEN-ODD NUCLEI
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PLASMA
POROSITY
RESONANCE
SILICA GEL
SILICON 29
SILICON COMPOUNDS
SILICON ISOTOPES
SILICON OXIDES
SILOXANES
STABLE ISOTOPES
SURFACE AREA
SURFACE PROPERTIES
SYNTHESIS