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Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing

The aim of this work was the development of a thermoplastic/thermosetting combined system with a novel production technique. A poly(caprolactone) (PCL) structure has been designed and produced by fused filament fabrication, and impregnated with an epoxy matrix. The mechanical properties, fracture to...

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Autores principales: Dorigato, Andrea, Rigotti, Daniele, Pegoretti, Alessandro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078803/
https://www.ncbi.nlm.nih.gov/pubmed/32054094
http://dx.doi.org/10.3390/ma13040819
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author Dorigato, Andrea
Rigotti, Daniele
Pegoretti, Alessandro
author_facet Dorigato, Andrea
Rigotti, Daniele
Pegoretti, Alessandro
author_sort Dorigato, Andrea
collection PubMed
description The aim of this work was the development of a thermoplastic/thermosetting combined system with a novel production technique. A poly(caprolactone) (PCL) structure has been designed and produced by fused filament fabrication, and impregnated with an epoxy matrix. The mechanical properties, fracture toughness, and thermal healing capacities of this blend (EP-PCL(3D)) were compared with those of a conventional melt mixed poly(caprolactone)/epoxy blend (EP-PCL). The fine dispersion of the PCL domains within the epoxy in the EP-PCL samples was responsible of a noticeable toughening effect, while in the EP-PCL(3D) structure the two phases showed an independent behavior, and fracture propagation in the epoxy was followed by the progressive yielding of the PCL domains. This peculiar behavior of EP-PCL(3D) system allowed the PCL phase to express its full potential as energy absorber under impact conditions. Optical microscope images on the fracture surfaces of the EP-PCL(3D) samples revealed that during fracture toughness tests the crack mainly propagated within the epoxy phase, while PCL contributed to energy absorption through plastic deformation. Due to the selected PCL concentration in the blends (35 vol %) and to the discrepancy between the mechanical properties of the constituents, the healing efficiency values of the two systems were rather limited.
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spelling pubmed-70788032020-04-21 Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing Dorigato, Andrea Rigotti, Daniele Pegoretti, Alessandro Materials (Basel) Article The aim of this work was the development of a thermoplastic/thermosetting combined system with a novel production technique. A poly(caprolactone) (PCL) structure has been designed and produced by fused filament fabrication, and impregnated with an epoxy matrix. The mechanical properties, fracture toughness, and thermal healing capacities of this blend (EP-PCL(3D)) were compared with those of a conventional melt mixed poly(caprolactone)/epoxy blend (EP-PCL). The fine dispersion of the PCL domains within the epoxy in the EP-PCL samples was responsible of a noticeable toughening effect, while in the EP-PCL(3D) structure the two phases showed an independent behavior, and fracture propagation in the epoxy was followed by the progressive yielding of the PCL domains. This peculiar behavior of EP-PCL(3D) system allowed the PCL phase to express its full potential as energy absorber under impact conditions. Optical microscope images on the fracture surfaces of the EP-PCL(3D) samples revealed that during fracture toughness tests the crack mainly propagated within the epoxy phase, while PCL contributed to energy absorption through plastic deformation. Due to the selected PCL concentration in the blends (35 vol %) and to the discrepancy between the mechanical properties of the constituents, the healing efficiency values of the two systems were rather limited. MDPI 2020-02-11 /pmc/articles/PMC7078803/ /pubmed/32054094 http://dx.doi.org/10.3390/ma13040819 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Dorigato, Andrea
Rigotti, Daniele
Pegoretti, Alessandro
Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title_full Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title_fullStr Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title_full_unstemmed Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title_short Novel Poly(Caprolactone)/Epoxy Blends by Additive Manufacturing
title_sort novel poly(caprolactone)/epoxy blends by additive manufacturing
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078803/
https://www.ncbi.nlm.nih.gov/pubmed/32054094
http://dx.doi.org/10.3390/ma13040819
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