Rheology of preceramic polymers

Reference	Presenter	Authors (Institution)	Abstract
18-048	Romain Lucas	Lucas, R.(Institut de Recherche sur les Céramiques); Foucaud, S.(Institut de Recherche sur les Céramiques); Bernard, S.(Institut de Recherche sur les Céramiques); Schmidt, M.(Institut de Recherche sur les Céramiques);	In the field of non-oxide ceramics, the Polymer-Derived Ceramic route appeared to be very promising, expecially in order to obtain easily shaped and homogeneous materials in terms of structure and composition. However, in order to reach a suitable form during the process, it is often necessary to study the rheology of preceramic polymers. Given this need in the understanding of the viscoelastic properties of macromolecules, this presentation will first focus on the rheological studies of preceramic polymers. In addition, because the physical and chemical properties of the precursor have to be predicted, monitored and why not controlled, a rheometer coupled with an infrared spectrometer will be presented as a powerful tool to monitor in situ synthesized polycarbosilanes. Indeed, this original device allows for the control of the viscosity of preceramic precursors and, at the same time, it gives a correlation of this evolution to the structural modifications in the macromolecular structure. The impact of the atmosphere will also be discussed, as well as the effect of the temperature on the polymerization, to access kinetic parameters.
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