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Open AccessArticle

Special Resins for Stereolithography: In Situ Generation of Silver Nanoparticles

1
Department of Engineering and Architecture, University of Parma, Parco Area delle Scienze 181/A, 43124 Parma, Italy
2
INSTM, National Interuniversity Consortium of Materials Science and Technology, Via Giusti 9, 50121 Florence, Italy
3
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.
Polymers 2018, 10(2), 212; https://doi.org/10.3390/polym10020212
Received: 19 January 2018 / Revised: 18 February 2018 / Accepted: 19 February 2018 / Published: 22 February 2018
(This article belongs to the Special Issue Thermosets)
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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MDPI and ACS Style

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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