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Issue 22, 2013
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Polymer reinforced silica aerogels: effects of dimethyldiethoxysilane and bis(trimethoxysilylpropyl)amine as silane precursors

Jason P. Randall,a  Mary Ann B. Meador*b  and  Sadhan C. Jana*a 
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* Corresponding authors

a Department of Polymer Engineering, University of Akron, Akron, USA
E-mail: janas@uakron.edu
Fax: +1 330 972 3406
Tel: +1 330 972 8293

b NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, USA
E-mail: maryann.meador@nasa.gov
Fax: +1 216 977 7132
Tel: +1 216 433 3221

Abstract

This study evaluated the effectiveness of dimethyldiethoxysilane (DMDES) precursor in improving the elastic recovery behavior of silica aerogels reinforced with epoxy through amine sites on the silica surface. In the study, two aminosilanes – 3-aminopropyltriethoxysilane (APTES) and bis(trimethoxysilylpropyl)amine (BTMSPA) – were considered as reactive sites for cross-linking with epoxy. Because of the way the samples were formulated, BTMSPA offered half the number of amine sites compared to APTES at the same level of substitution. Replacing tetraethoxysilane (TEOS) with at least 15 mol% DMDES reduced the number of silicon–oxygen bonds in the aerogel networks and resulted in improved elastic recovery, but up to an order of magnitude lower compressive modulus. BTMSPA aerogels demonstrated strong elastic response without DMDES, with some samples showing near complete recovery. However, these aerogels offered lower modulus than APTES aerogels.

Graphical abstract: Polymer reinforced silica aerogels: effects of dimethyldiethoxysilane and bis(trimethoxysilylpropyl)amine as silane precursors

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Publication details

The article was received on 11 Mar 2013, accepted on 18 Apr 2013 and first published on 19 Apr 2013


Article type: Paper
DOI: 10.1039/C3TA11019B
Citation: J. Mater. Chem. A, 2013,1, 6642-6652
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    Polymer reinforced silica aerogels: effects of dimethyldiethoxysilane and bis(trimethoxysilylpropyl)amine as silane precursors

    J. P. Randall, M. A. B. Meador and S. C. Jana, J. Mater. Chem. A, 2013, 1, 6642
    DOI: 10.1039/C3TA11019B

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