Sol-gel synthesis, porous structure, and mechanical property of polymethylsilsesquioxane aerogels

Organic-inorganic hybrid aerogels with polymethylsilsesquioxane (PMSQ, CH3SiO1.5) composition have been synthesized by a modified two-step sol-gel process. The precursor alkoxysilane is hydrolyzed in a weakly acidic condition, and subsequently allowed to undergo polycondensation in a weakly basic co...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2009, Vol.117(1372), pp.1333-1338
Main Authors: KANAMORI, Kazuyoshi, NAKANISHI, Kazuki, HANADA, Teiichi
Format: Article
Language:English
Subjects:
Aerogels
Mechanical property
Nitrogen adsorption
Organic-inorganic hybrid
Porous structure
Small angle X-ray scattering (SAXS)
Sol-gel
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Summary:Organic-inorganic hybrid aerogels with polymethylsilsesquioxane (PMSQ, CH3SiO1.5) composition have been synthesized by a modified two-step sol-gel process. The precursor alkoxysilane is hydrolyzed in a weakly acidic condition, and subsequently allowed to undergo polycondensation in a weakly basic condition which is brought up by the hydrolysis of urea. Two kinds of surfactant (nonionic and cationic) have been utilized to suppress macroscopic phase separation. The resultant porous morphology could be modified by the kind of surfactant used. Small angle X-ray scattering (SAXS) and nitrogen adsorption have been employed to assess the porous morphology and it is found that the obtained PMSQ aerogels consist of aggregated particles and each particle contains micropores. Compressive mechanical properties have also been discussed based on the obtained information on porous morphology.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.117.1333