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Record Details

Record 1 of 6161
Epoxy Crosslinked Silica Aerogels (X-Aerogels)
Author and Affiliation:
fabrizio, Eve(Ohio Aerospace Inst., Cleveland, OH, United States)
Ilhan, Faysal(Ohio Aerospace Inst., Cleveland, OH, United States)
Meador, Mary Ann(NASA Glenn Research Center, Cleveland, OH, United States)
Johnston, Chris(NASA Glenn Research Center, Cleveland, OH, United States)
Leventis, Nicholas(NASA Glenn Research Center, Cleveland, OH, United States)
Abstract: NASA is interested in the development of strong lightweight materials for the dual role of thermal insulator and structural component for space vehicles; freeing more weight for useful payloads. Aerogels are very-low density materials (0.010 to 0.5 g/cc) that, due to high porosity (meso- and microporosity), can be, depending on the chemical nature of the network, ideal thermal insulators (thermal conductivity approx. 15 mW/mK). However, aerogels are extremely fragile. For practical application of aerogels, one must increase strength without compromising the physical properties attributed to low density. This has been achieved by templated growth of an epoxy polymer layer that crosslinks the "pearl necklace" network of nanoparticles: the framework of a typical silica aerogel. The requirement for conformal accumulation of the epoxy crosslinker is reaction both with the surface of silica and with itself. After cross-linking, the strength of a typical aerogel monolith increases by a factor of 200, in the expense of only a 2-fold increase in density. Strength is increased further by coupling residual unreacted epoxides with diamine.
Publication Date: Jan 01, 2004
Document ID:
20050203973
(Acquired Aug 25, 2005)
Subject Category: NONMETALLIC MATERIALS
Report/Patent Number: Paper 711229
Document Type: Preprint
Meeting Information: 227th National American Chemical Society Meeting; 28 Mar. - 1 Apr. 2004; Anaheim, CA; United States
Meeting Sponsor: American Chemical Society; United States
Contract/Grant/Task Num: 22-708-93-11
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH, United States
Organization Source: NASA Glenn Research Center; Cleveland, OH, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: AEROGELS; XEROGELS; SILICA GEL; CROSSLINKING; POROUS MATERIALS; LOW DENSITY MATERIALS; EPOXY COMPOUNDS
Availability Source: Other Sources
Availability Notes: Abstract Only
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