About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
High Fidelity Additive Manufacturing of PMDA-ODA Polyimide via Supramolecular Salts |
Author(s) |
John W. Will, Clay B Arrington, Cody W Weyhrich, Timothy E Long, Christopher B Williams |
On-Site Speaker (Planned) |
John W. Will |
Abstract Scope |
All-aromatic polyimides offer strong abrasion resistance, dielectric properties, and chemical resistance across a broad temperature range, making them invaluable materials in the aerospace and electronics industry. Additive manufacturing provides an opportunity to advance from 2D polyimide films to more complex parts with intricate geometries that can withstand temperatures exceeding 500°C. Previous efforts to print all-aromatic polyimide precursor photopolymer resins had high viscosity, low solids loading, and were arduous to synthesize. In this work, a supramolecular salt approach replaces high molecular weight polyamic acid precursors with small molecule precursors that associate via salt interactions until post-print polymerization, greatly reducing resin viscosity with facile synthesis. Successful printing of a new polyimide precursor resin with 50wt% solids loading, low viscosity (<1Pas), and 26% linear isotropic shrinkage is demonstrated. Resulting properties are shown to be equivalent to traditional 2D film polyimides. In addition, the resultant all-aromatic polyimides are converted to graphitic carbon via pyrolysis. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |