About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
Improving Vat Photopolymerization Part Performance via Thermally Activated Bond Exchange |
Author(s) |
Daniel A. Rau, Leslie S Hamachi, Clay B. Arrington , Daylan T. Sheppard, David J. Fortman, Timothy E. Long, Christopher B. Williams, William R. Dichtel |
On-Site Speaker (Planned) |
Daniel A. Rau |
Abstract Scope |
Vat photopolymerization (VP) offers designers excellent surface finish, feature resolution, and throughput, but layer interfaces in the printed materials can limit their tensile properties. To improve interlayer network formation via self-healing, we demonstrate the development and VP printing of a novel urethane acrylate resin containing carbamate bonds. In the presence of a dibutyltin dilaurate (DBTDL) catalyst and heat, the carbamate bonds undergo dissociative exchange resulting in rapid stress relaxation. ZX tensile samples with layers perpendicular to tensile load demonstrate an increase in elongation at break after thermal annealing, indicative of self-healing. The strain at break for samples containing catalyst increase from 33.9% to 56.0% after annealing, compared to a decrease from 48.1% to 32.1% in control samples without catalyst. This thermally activated bond exchange process improves the performance of VP-printed materials via self-healing at layer interfaces and provides a means to change the Young’s modulus after printing. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |