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Tailoring Elastic Properties of Silica Aerogels Cross-Linked with PolystyreneThe effect of incorporating an organic linking group, 1,6-bis(trimethoxysilyl)hexane (BTMSH), into the underlying silica structure of a styrene cross-linked silica aerogel is examined. Vinyltrimethoxysilane (VTMS) is used to provide a reactive site on the silica backbone for styrene polymerization. Replacement of up to 88 mol 1 of the silicon from tetramethoxyorthosilicate with silicon derived from BTMSH and VTMS during the making of silica gels improves the elastic behavior in some formulations of the crosslinked aerogels, as evidenced by measurement of the recovered length after compression of samples to 251 strain. This is especially true for some higher density formulations, which recover nearly 100% of their length after compression to 251 strain twice. The compressive modulus of the more elastic monoliths ranged from 0.2 to 3 MPa. Although some of these monoliths had greatly reduced surface areas, changing the solvent used to produce the gels from methanol to ethanol increased the surface area in one instance from 6 to 220 sq m2/g with little affect on the modulus, elastic recovery, porosity, or density.
Document ID
20090042368
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Nguyen, Baochau N.
(NASA Glenn Research Center Cleveland, OH, United States)
Meador, Mary Ann B.
(NASA Glenn Research Center Cleveland, OH, United States)
Tousley, Marissa E.
Shonkwiler, Brian
(Atlanta Univ. GA, United States)
McCorkle, Linda
(Ohio Aerospace Inst. Brook Park, OH, United States)
Scheiman, Daniel A.
(ASRC Aerospace Corp. Cleveland, OH, United States)
Palczer, Anna
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Publication Information
Publication: ACS Applied Materials and Interfaces
Volume: 1
Issue: 3
Subject Category
Chemistry And Materials (General)
Report/Patent Number
E-17159
Funding Number(s)
WBS: WBS 561581.02.10.03.09
CONTRACT_GRANT: NNC07BA13B
Distribution Limits
Public
Copyright
Other

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