Controlled conversion approaches to selective laser sintering (SLS) printing of high Tg thermosets
March 8 – 12, 2020
Thermoset materials display superior physical and mechanical properties as compared to commonly printed semi-crystalline thermoplastics, yet they typically are not printed by selective laser sintering (SLS). This is because these materials require a post-print thermal cure above Tg to achieve maximal properties. However, such thermal treatment typically results in re-melting of the printed part. Current approaches to printing thermoset materials by this technique have largely relied on infiltrating a porous thermoplastic printed object with a low viscosity reactive resin which is then cured. More recently, direct printing of thermoset materials was also demonstrated, but these approaches require very rapid curing which is often also associated with reduced shelf-life and/or high filler content which may not be desired. Other higher temperature thermoplastics with superior properties (PPS and PEEK) have also been printed using this technique, but the printing of these requires specially designed high-temperature (200-300°C) printing chambers.
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Christopher G. Campbell, Dominik Astorga, Rachel Collino, and Mathew C Celina, "Controlled conversion approaches to selective laser sintering (SLS) printing of high Tg thermosets" in "Innovative Materials For Additive Manufacturing (IMAM)", Daniel Schmidt, Luxembourg Institute of Science and Technology, Luxembourg Nikhil Gupta, New York University, USA Chua Chee Kai, NTU, Singapore Brett G. Compton, University of Tennessee, USA Eds, ECI Symposium Series, (2020). https://dc.engconfintl.org/imam/23