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Polymers 2019, 11(1), 116; https://doi.org/10.3390/polym11010116

Photoinitiator Free Resins Composed of Plant-Derived Monomers for the Optical µ-3D Printing of Thermosets

1
Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Rd. 19, 50254 Kaunas, Lithuania
2
Laser Research Center, Vilnius University, Sauletekis Ave. 10, 10223 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Received: 19 December 2018 / Revised: 4 January 2019 / Accepted: 6 January 2019 / Published: 11 January 2019
(This article belongs to the Special Issue Thermosets II)
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Abstract

In this study, acrylated epoxidized soybean oil (AESO) and mixtures of AESO and vanillin dimethacrylate (VDM) or vanillin diacrylate (VDA) were investigated as photosensitive resins for optical 3D printing without any photoinitiator and solvent. The study of photocross-linking kinetics by real-time photorheometry revealed the higher rate of photocross-linking of pure AESO than that of AESO with VDM or VDA. Through the higher yield of the insoluble fraction, better thermal and mechanical properties were obtained for the pure AESO polymer. Here, for the first time, we validate that pure AESO and mixtures of AESO and VDM can be used for 3D microstructuring by employing direct laser writing lithography technique. The smallest achieved spatial features are 1 µm with a throughput in 6900 voxels per second is obtained. The plant-derived resins were laser polymerized using ultrashort pulses by multiphoton absorption and avalanche induced cross-linking without the usage of any photoinitiator. This advances the light-based additive manufacturing towards the 3D processing of pure cross-linkable renewable materials. View Full-Text
Keywords: acrylated epoxidized soybean oil; vanillin dimethacrylate; vanillin diacrylate; photocross-linking; direct laser writing; nanolithography; optical 3D printing; two-photon polymerization (2PP); multi-photon processing acrylated epoxidized soybean oil; vanillin dimethacrylate; vanillin diacrylate; photocross-linking; direct laser writing; nanolithography; optical 3D printing; two-photon polymerization (2PP); multi-photon 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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Lebedevaite, M.; Ostrauskaite, J.; Skliutas, E.; Malinauskas, M. Photoinitiator Free Resins Composed of Plant-Derived Monomers for the Optical µ-3D Printing of Thermosets. Polymers 2019, 11, 116.

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