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Influence of the Degree of Cure in the Bulk Properties of Graphite Nanoplatelets Nanocomposites Printed via Stereolithography

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URI: http://hdl.handle.net/10498/23356

DOI: 10.3390/polym12051103

ISSN: 2073-4360

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Author/s
Sanz de León, Alberto; Molina Rubio, Sergio Ignacio
Date
2020-05
Department
Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
Source
Polymers 2020, 12(5), 1103
Abstract
In this work, we report on the fabrication via stereolithography (SLA) of acrylic-based nanocomposites using graphite nanoplatelets (GNPs) as an additive. GNPs are able to absorb UV-Vis radiation, thus blocking partial or totally the light path of the SLA laser. Based on this, we identified a range of GNP concentrations below 2.5 wt %, where nanocomposites can be successfully printed. We show that, even though GNP is well-dispersed along the polymeric matrix, nanocomposites presented lower degrees of cure and therefore worse mechanical properties when compared with pristine resin. However, a post-processing at 60 degrees C with UV light for 1 h eliminates this difference in the degree of cure, reaching values above 90% in all cases. In these conditions, the tensile strength is enhanced for 0.5 wt % GNP nanocomposites, while the stiffness is increased for 0.5-1.0 wt % GNP nanocomposites. Finally, we also demonstrate that 2.5 wt % GNP nanocomposites possess characteristic properties of semiconductors, which allows them to be used as electrostatic dispersion materials.
Subjects
3D printing; stereolithography; nanocomposites; correlation of bulk and molecular properties; physical methods of analysis; mechanical properties; electrical properties
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Atribución 4.0 Internacional
This work is under a Creative Commons License Atribución 4.0 Internacional

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