Journal
LANGMUIR
Volume 28, Issue 43, Pages 15362-15371Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la302945b
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Funding
- National Science Foundation [CMMI-1200484]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1200484] Funding Source: National Science Foundation
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This study evaluated polyhedral oligomeric silsesquioxane (POSS) molecules as useful, multifunctional reinforcing agents of silica aerogels. Silica aerogels have low-density and high surface area, although their durability is often compromised by the inherent fragility and strong moisture absorption behavior of the silica networks. POSS molecules carrying phenyl, iso-butyl, and cyclohexyl organic side groups, and several Si-OH functionalities were incorporated into silica networks via reactions between Si-OH functionalities in POSS molecules and silanes. Solid state C-13 and Si-29 NMR spectra established that greater than 9096 of POSS molecules grafted onto silica networks and led to an increase in fractal dimensions. An almost 6-fold increase in compressive modulus was achieved with less than 5 wt % trisilanol phenyl POSS, and a 50-fold decrease in polarity with negligible changes in density were seen in aerogels modified with less than 5 wt % trisilanol isobutyl POSS.
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