| Title |
Vanillin derivatives as resins for optical 3D printing |
| Authors |
Navaruckiene, A ; Skliutas, E ; Malinauskas, M ; Ostrauskaite, J |
| ISBN |
9786090705575 |
| Full Text |
|
| Is Part of |
NBCM 2020: international conference on nanostructured bioceramic materials, 1-3 December 2020, Vilnius, Vilnius University: conference book.. Vilnius : Vilnius Univerity Press, 2020. p. 58.. ISBN 9786090705575 |
| Keywords [eng] |
vanillin derivatives ; resins ; optical 3D printing |
| Abstract [eng] |
3D printing, also known as additive manufacturing has drawn increasing attention globally and has made a revolutionary impact on product fabrication in such areas like food industry, textiles, architecture, medicine, and construction [1]. Polymers are widely used in our everyday life due to their diverse properties and relatively low cost; however, it is difficult to form intricate geometries from them. Additive manufacturing is a solution to create complex geometries from plastics [2]. In this study, the cross-linked polymers were obtained by free-radical photocross-linking of vanillin diacrylate and vanillin dimethacrylate using ethyl(2,4,6-trimethylbenzoyl) phenylphosphinate as photoinitiator. The chemical structure of obtained polymers was confirmed by FT-IR spectroscopy. The yield of insoluble fraction obtained after Soxhlet extraction with acetone after 24 hours was in the range of (77-96) %. The cross-linking density calculated from the real-time photorheometry storage modulus curve at the steady state was in the range of (49-7928) mol/m3. Thermal and mechanical properties of vanillin diacrylate-based and vanillin dimethacrylate-based polymer films were investigated. Real-time photorheometry was used to monitore the evolution of free-radical photocross-linking process. The tests were performed on a MCR302 rheometer from Anton Paar equipped with the plate/plate measuring system. The samples were irradiated by UV/Vis light in a wavelength range of 250-450 nm through the glass plate using UV/Vis spot curing system OmniCure S2000, Lumen Dynamics Group Inc. The sufficient amount of photoinitiator was determined by comparing compositions containing 1-5 mol.% of photoinitiator. In most cases photopolymerization was faster and more rigid polymers were obtained when 3 mol.% of ethyl(2,4,6-trimethylbenzoyl) phenylphosphinate were used. The most rigid polymers were obtained by free-radical photocross-linking of vanillin dimethacrylate, however its films were fragile. Optical printing techniques, direct laser writing and microtransfer molding, were used to produce 3D objects out of vanillin diacrylate-based photocross-linkable resin. A test to assess the optimal fabrication parameters was performed and the capability to produce 3D microporous 75 × 75 μm2 woodpile structures out of the resin via direct laser writing was demonstrated. 3D printed objects of vanillin diacrylate-based resin with 3 mol.% of ethyl(2,4,6-trimethylbenzoyl) phenylphosphinate corresponded to the used 3D model. |
| Published |
Vilnius : Vilnius Univerity Press, 2020 |
| Type |
Conference paper |
| Language |
English |
| Publication date |
2020 |
| CC license |
|
