About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
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| Presentation Title |
Multilayer 3D Printed Carbonaceous Structures with Hyperbranched Pre-Ceramic Polymeric Coatings |
| Author(s) |
Arko Dasa, Jordan Sinclair, Garvit Nayyar, Margaret Madsen, Christina Birkel, Timothy E. Long |
| On-Site Speaker (Planned) |
Timothy E. Long |
| Abstract Scope |
Hyperbranched pre-ceramic poly(carbosilanes) enable the formation of silicon carbide (SiC) ceramics via pyrolysis. The hyperbranched structure, which offers low viscosities, is prepared with a conventional AB2 monomer strategy to form a highly branched architecture with a plurality of terminal vinyl silanes. The terminal vinyl sites are amenable to further functionalization with diverse reagents. This solvent-free, liquid pre-ceramic polymer (PCP) cures at low temperatures (200-350 °C), produces amorphous SiC upon pyrolysis between 800–1200 °C, and yields crystalline β-SiC at temperatures above 1400 °C, with a char yield of approximately 80%. The resulting ceramic exhibits high thermal stability up to 1600 °C, thus providing an ideal material for many emerging technologies. The pre-ceramic polymers are readily coated onto 3D printed carbonaceous structures, which are derived from vat photopolymerization (VPP) of aromatic polyimides, and pyrolyzed to 1600 °C. Scanning electron microscopy (SEM) analysis reveals excellent adhesion of the ceramic onto the carbonaceous support due to mechanical interlocking of the PCP into the porous underlying carbon. |