Synthesis and characterization of polyvinylsilazane as a precursor for Si3N4 based ceramic materials |
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Authors: | Justin W. Reutenauer Timothy P. Coons Christopher L. Hill Kevin A. Arpin Michael A. Kmetz Steven L. Suib |
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Affiliation: | 1. Department of Chemistry, University of Connecticut, Unit 3060, 55 North Eagleville Road, Storrs, CT, 06269-3060, USA 2. Pratt and Whitney, 400 Main Street M/S 114-43, East Hartford, CT, 06108, USA
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Abstract: | This investigation focused on the synthesis and characterization of a polyvinylsilazane (PVSZ) polymer. This material shows promise as a precursor for silicon nitride/silicon carbide based ceramic materials. The polymer was synthesized via the ammonolysis of vinyltrichlorosilane (VTS) in tetrahydrofuran (THF). The polymer was characterized using Fourier Transform Infrared (FT-IR) spectroscopy, 1H/13C nuclear magnetic resonance (NMR) spectroscopy, and gel permeation chromatography (GPC). This polymer was found to have a molecular weight of around 880 g/mol, as determined by GPC. Thermal cross-linking, up to 1500 °C in an inert atmosphere, produced a ceramic material with a char yield of around 85%. The gas by-products from the partial decomposition of the polymer to a ceramic material were characterized using residual gas analysis (RGA). The crystallite phases of the ceramic char, pyrolyzed in different atmospheres, were determined by X-ray powder diffraction (XRD). Lastly, the ability of the polymer to form a free standing monolithic structure as well as the ability to be drawn into fibers was evaluated. |
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