New poly(silanes-siloxanes) via hydrosilation in supercritical CO2 and subsequent crosslinking
| Autor: | Patrick E. Cassidy, Hui Zhou, John W. Fitch, Sreenu R. Venumbaka |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
chemistry.chemical_classification
Supercritical carbon dioxide Silanes Materials science Polymers and Plastics Hydrosilylation Organic Chemistry Polymer Condensed Matter Physics Supercritical fluid chemistry.chemical_compound chemistry Polymerization Siloxane Polymer chemistry Materials Chemistry Thermal stability |
| Zdroj: | Macromolecular Symposia. 192:115-122 |
| ISSN: | 1521-3900 1022-1360 |
| Popis: | In order to obtain crosslinkable, low dielectric, low Tg materials, the hydrosilation polymerization was carried out in supercritical carbon dioxide (SC CO 2 ) using Karstedt's catalyst, and a series of new fluorine-containing poly(carbosilane/siloxane) were synthesized and characterized. The molecular weights of polymers obtained in SC CO 2 were notably greater than those obtained in benzene. Hydrolysis and thermal curing of these polymers leads to materials considerably higher molecular weight which retain their low Tg values. |
| Databáze: | OpenAIRE |
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