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Open AccessArticle

Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends

1
POLYMAT, Department of Polymer Science and Technology, University of the Basque Country UPV-EHU, PO Box 1072, 20080 Donostia/San Sebastian, Gipuzkoa, Spain
2
Macrobehaviour-Mesostructure-Nanotechnology SGIker Service, Faculty of Engineering, University of the Basque Country UPV-EHU, Plaza Europa 1, 20018 Donostia/San Sebastian, Gipuzkoa, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Laura Peponi and Valentina Sessini
Molecules 2020, 25(7), 1568; https://doi.org/10.3390/molecules25071568
Received: 31 January 2020 / Revised: 27 March 2020 / Accepted: 28 March 2020 / Published: 29 March 2020
(This article belongs to the Special Issue Advances in Shape Memory Polymers and Polymeric Nanocomposites)
Epoxy/Polycaprolactone (PCL) blends cured with a conventional diamine (4,4′-diaminodiphenylmethane, DDM) and with different amounts of a disulfide containing diamine (4, 4´-dithioaniline, DSS) were prepared through melting. The curing process was studied by FTIR and differential scanning calorimetry (DSC) and the mechanical behavior of the networks was studied by DMA. The shape memory properties and the recyclability of the materials were also analyzed. All blends showed a very high curing degree and temperature activated shape memory effect, related to the glass transition of the epoxy resin. The PCL plasticized the mixture, allowing tailoring of the epoxy glass transition. In addition, in the blends cured with DSS, as a consequence of the disulfide exchange reaction, the permanent shape could be erased and a new shape could be reprogrammed. Using this strategy, reprogrammable permanent shape memory materials were obtained. View Full-Text
Keywords: epoxy; polycaprolactone; shape memory; reprogrammable permanent shape epoxy; polycaprolactone; shape memory; reprogrammable permanent shape
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MDPI and ACS Style

Razquin, I.; Iregui, A.; Orduna, L.; Martin, L.; González, A.; Irusta, L. Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends. Molecules 2020, 25, 1568. https://doi.org/10.3390/molecules25071568

AMA Style

Razquin I, Iregui A, Orduna L, Martin L, González A, Irusta L. Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends. Molecules. 2020; 25(7):1568. https://doi.org/10.3390/molecules25071568

Chicago/Turabian Style

Razquin, Iker; Iregui, Alvaro; Orduna, Lidia; Martin, Loli; González, Alba; Irusta, Lourdes. 2020. "Reprogrammable Permanent Shape Memory Materials Based on Reversibly Crosslinked Epoxy/PCL Blends" Molecules 25, no. 7: 1568. https://doi.org/10.3390/molecules25071568

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