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Hybrid Silica/Polymer Aerogels Dried at Ambient Pressure
| Content Provider | Semantic Scholar |
|---|---|
| Author | Fidalgo, Alexandra Farinha, José P. Sequeira Martinho, J. M. Gaspar Rosa, A. Mastromauro Ilharco, Laura M. |
| Copyright Year | 2007 |
| Abstract | A novel sol−gel route was developed to prepare monolithic hybrid silica/polymer aerogels, stable under atmospheric conditions and suitable for machining. The synthesis of the hybrid wet gels followed a two-step hydrolysis/polycondensation of tetraethoxysilane with excess water, in 2-propanol. Cohydrolysis with trimethoxysilyl-modified poly(butyl metacrylate-co-butyl acrylate) cross-linked nanoparticles (average diameter of 94 nm) was carried out. Different alcogels were prepared varying the hydrolysis and condensation catalysis conditions and the polymer content (0−50% in weight). The aged alcogels were subcritically dried in a quasi-saturated solvent atmosphere. The resulting xerogels were characterized by dry-flow pycnometry, nitrogen adsorption−desorption, scanning electron microscopy (SEM), and diffuse reflectance infrared spectroscopy (DRIFT), and their mechanical properties were evaluated by unidirectional compression tests. The hybrid aerogels show improved mechanical properties with respect to the. |
| Starting Page | 2603 |
| Ending Page | 2609 |
| Page Count | 7 |
| File Format | PDF HTM / HTML |
| DOI | 10.1021/cm062962w |
| Volume Number | 19 |
| Alternate Webpage(s) | https://web.ist.utl.pt/ist10984/PDF/2007/Chem%20Mater%2019_2603-2609_2007.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
