Chemical, Physical, and Mechanical Characterization of Isocyanate Cross-linked Amine-Modified Silica Aerogels

We describe a new mechanically strong lightweight porous composite material obtained by encapsulating the skeletal framework of amine-modified silica aerogels with polyurea. The conformal polymer coating preserves the mesoporous structure of the underlying silica framework and the thermal conductivi...

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Bibliographic Details
Published in:Chemistry of materials 2006-01, Vol.18 (2), p.285-296
Main Authors: Katti, Atul, Shimpi, Nilesh, Roy, Samit, Lu, Hongbing, Fabrizio, Eve F, Dass, Amala, Capadona, Lynn A, Leventis, Nicholas
Format: Article
Language:English
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Summary:We describe a new mechanically strong lightweight porous composite material obtained by encapsulating the skeletal framework of amine-modified silica aerogels with polyurea. The conformal polymer coating preserves the mesoporous structure of the underlying silica framework and the thermal conductivity remains low at 0.041 ± 0.001 W m-1 K-1. The potential of the new cross-linked silica aerogels for load-carrying applications was determined through characterization of their mechanical behavior under compression, three-point bending, and dynamic mechanical analysis (DMA). A primary glass transition temperature of 130 °C was identified through DMA. At room temperature, results indicate a hyperfoam behavior where in compression cross-linked aerogels are linearly elastic under small strains (
ISSN:0897-4756
1520-5002
DOI:10.1021/cm0513841