Rheological and thermal behaviours of a hyperbranched polycarbosilane |
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| Authors: | Cassandre Piriou Lucas Viers Romain Lucas Fabien Bouzat Hatim Laadoua Yves Champavier Sylvie Foucaud Cristina Coelho Florence Babonneau |
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| Affiliation: | 1. Université de Limoges, Limoges, France;2. BISCEm, Service de RMN, CBRS, Limoges, France;3. Sorbonne Université, CNRS, Institut des Matériaux de Paris‐Centre, Paris, France;4. Sorbonne Université, CNRS, Collège de France, Laboratoire de Chimie de la Matière Condensée de Paris, LCMCP, Paris, France |
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| Abstract: | A hyperbranched polymer, a precursor of silicon carbide (SiC), was successfully synthesized using a hydrosilylation reaction with Karstedt's catalyst. This reaction was optimized with the use of a rheometer coupled with an infrared spectrometer. The polymeric precursor was characterized using NMR and Fourier transform infrared spectroscopies, and dynamic rheology. The polymerization reaction was followed in situ by combined rheological and infrared measurements, indicating a gel‐like behaviour for alkene conversions higher than 0.55. Overall second‐order kinetics was determined for the hydrosilylation reaction. Pyrolysis at 1400 °C led to porous materials with β‐SiC and free carbon. |
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| Keywords: | hydrosilylation infrared spectroscopy polycarbosilane rheology silicon carbide |
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