[Back]


Talks and Poster Presentations (without Proceedings-Entry):

J. Kollmer, P. Dorfinger, C. Gorsche, R. Liska, J. Stampfl:
"Toughening and coloring of photopolymers for lithography-based 3D-printing";
Talk: 6th International Conference on Additive Technologies iCAT 2016, Nürnberg; 11-29-2016 - 11-30-2016.



English abstract:
Lithography-based additive manufacturing technology (L-AMT) is a layered manufacturing approach where liquid photopolymerizable resins are solidified with ultraviolet or visible light. Advantages of the L-AMT are the excellent precision and the high achievable feature resolution. With the L-AMT systems (developed at the TU Wien) used for this work, resolutions of <20μm are achievable. Disadvantages of L-AMT are the currently insufficient mechanical properties of the final parts. Highly crosslinked photopolymers are typically quite brittle and in many cases not suitable for load-bearing applications. Due to the low glass transition temperature (Tg) of existing AM-materials the heat deflection temperature is not high enough in many instances. In this work high-molecular-weight (meth)acrylate-based resins are investigated regarding their mechanical properties (toughness, strength and heat deflection temperature). The goal is to mimic the thermo-mechanical properties and color variation of engineering polymers like ABS and polypropylene. A high base Tg allows the incorporation of Tg-lowering toughening agents like core-shell particles. The Charpy impact strength of 24 kJ/m, elongation at break of 44 %, while significant increasing of the heat deflection temperature (Tg 118 C) show a considerably improvement; compared with other SLA-materials.

Keywords:
Lithography-based additive manufacturing technology; Core-shell particles; Chain transfer agents; Photopolymer

Created from the Publication Database of the Vienna University of Technology.