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Polymers 2018, 10(2), 212;

Special Resins for Stereolithography: In Situ Generation of Silver Nanoparticles

Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
INSTM, National Interuniversity Consortium of Materials Science and Technology, Via Giusti 9, 50121 Florence, Italy
Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, Via Pietro Vivarelli 10/1, 41121 Modena, MO, Italy
Author to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 18 February 2018 / Accepted: 19 February 2018 / Published: 22 February 2018
(This article belongs to the Special Issue Thermosets)
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The limited availability of materials with special properties represents one of the main limitations to a wider application of polymer-based additive manufacturing technologies. Filled resins are usually not suitable for vat photo-polymerization techniques such as stereolithography (SLA) or digital light processing (DLP) due to a strong increment of viscosity derived from the presence of rigid particles within the reactive suspension. In the present paper, the possibility to in situ generate silver nanoparticles (AgNPs) starting from a homogeneous liquid system containing a well dispersed silver salt, which is subsequently reduced to metallic silver during stereolithographic process, is reported. The simultaneous photo-induced cross-linking of the acrylic resin produces a filled thermoset resin with thermal-mechanical properties significantly enhanced with respect to the unfilled resin, even at very low AgNPs concentrations. With this approach, the use of silver salts having carbon-carbon double bonds, such as silver acrylate and silver methacrylate, allows the formation of a nanocomposite structure in which the release of by-products is minimized due to the active role of all the reactive components in the three dimensional (3D)-printing processes. The synergy, between this nano-technology and the geometrical freedom offered by SLA, could open up a wide spectrum of potential applications for such a material, for example in the field of food packaging and medical and healthcare sectors, considering the well-known antimicrobial effects of silver nanoparticles. View Full-Text
Keywords: 3D printing; stereolithography; acrylic resin; nanocomposite; silver nanoparticles; in situ generation 3D printing; stereolithography; acrylic resin; nanocomposite; silver nanoparticles; in situ generation

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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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Taormina, G.; Sciancalepore, C.; Bondioli, F.; Messori, M. Special Resins for Stereolithography: In Situ Generation of Silver Nanoparticles. Polymers 2018, 10, 212.

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