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Materials 2017, 10(12), 1445; doi:10.3390/ma10121445

Visible Light Photoinitiator for 3D-Printing of Tough Methacrylate Resins

1
Institute of Materials Science and Technology, TU Wien, 1060 Wien, Austria
2
Institute of Applied Synthetic Chemistry, TU Wien, 1060 Wien, Austria
*
Author to whom correspondence should be addressed.
Received: 28 November 2017 / Revised: 17 December 2017 / Accepted: 18 December 2017 / Published: 19 December 2017
(This article belongs to the Special Issue NextGen Materials for 3D Printing)
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Abstract

Lithography-based additive manufacturing was introduced in the 1980s, and is still the method of choice for printing accurate plastic parts with high surface quality. Recent progress in this field has made tough photopolymer resins and cheap LED light engines available. This study presents the influence of photoinitiator selection and post-processing on the thermomechanical properties of various tough photopolymers. The influence of three photoinitiators (Ivocerin, BAPO, and TPO-L) on the double-bond conversion and mechanical properties was investigated by mid infrared spectroscopy, dynamic mechanical analysis and tensile tests. It was found that 1.18 wt % TPO-L would provide the best overall results in terms of double-bond conversion and mechanical properties. A correlation between double-bond conversion, yield strength, and glass transition temperature was found. Elongation at break remained high after post-curing at about 80–100%, and was not influenced by higher photoinitiator concentration. Finally, functional parts with 41 MPa tensile strength, 82% elongation at break, and 112 °C glass transition temperature were printed on a 405 nm DLP (digital light processing) printer. View Full-Text
Keywords: photopolymer; photoinitiator; additive manufacturing; digital light processing photopolymer; photoinitiator; additive manufacturing; digital light processing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Steyrer, B.; Neubauer, P.; Liska, R.; Stampfl, J. Visible Light Photoinitiator for 3D-Printing of Tough Methacrylate Resins. Materials 2017, 10, 1445.

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