Strengthening silica aerogels with surface initiated ATRP cross-linked poly(methyl methacrylate)
| Autor: | Dylan J. Boday, Douglas A. Loy |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Supercritical carbon dioxide
Materials science Atom-transfer radical-polymerization Supercritical drying Ethylene glycol dimethacrylate Aerogel Condensed Matter Physics Poly(methyl methacrylate) Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound chemistry visual_art Polymer chemistry Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Methanol |
| Zdroj: | Journal of Non-Crystalline Solids. 427:114-119 |
| ISSN: | 0022-3093 |
| Popis: | Silica aerogels were strengthened by surface initiated atom transfer radical polymerization (SI-ATRP) of methyl methacylate (MMA) and ethylene glycol dimethacrylate (EGDMA) from ATRP initiators grafted to the gel before supercritical drying. Tetramethoxysilane (TMOS) was copolymerized in methanol with 2.67 mol% of the ATRP initiator, 3-(triethoxysilyl)propyl-2-bromo-2-methylpropanoate, to afford gels. After replacing the methanol with toluene and adding copper catalyst, MMA and EGDMA (1:1), highly cross-linked poly(MMA-co-EGDMA) was grown from the surface of the aggregated particles making up the gel. After supercritical carbon dioxide drying, the result was highly porous poly(MMA-co-EGDMA)-silica aerogel composites that were significantly stronger than silica aerogels or poly(MMA)-silica aerogel composites of the same density. |
| Databáze: | OpenAIRE |
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