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Epoxy-based shape-memory actuators obtained via dual-curing of off-stoichiometric \"thiol-epoxy\" mixtures

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hdl:2117/103893

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Belmonte, Alberto
Russo, Claudio
Ambrogi, Veronica
Fernández Francos, XavierMés informacióMés informacióMés informació
Flor López, Sílvia de laMés informació
Document typeArticle
Defense date2017-03-21
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
Except where otherwise noted, content on this work is licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
In this work, epoxy-based shape-memory actuators have been developed by taking advantage of the sequential dual-curing of off-stoichiometric “thiol–epoxy” systems. Bent-shaped designs for flexural actuation were obtained thanks to the easy processing of these materials in the intermediate stage (after the first curing process), and successfully fixed through the second curing process. The samples were programmed into a flat temporary-shape and the recovery-process was analyzed in unconstrained, partially-constrained and fully-constrained conditions using a dynamic mechanical analyzer (DMA). Different “thiol–epoxy” systems and off-stoichiometric ratios were used to analyze the effect of the network structure on the actuation performance. The results evidenced the possibility to take advantage of the flexural recovery as a potential actuator, the operation of which can be modulated by changing the network structure and properties of the material. Under unconstrained-recovery conditions, faster and narrower recovery-processes (an average speed up to 80%/min) are attained by using materials with homogeneous network structure, while in partially- or fully-constrained conditions, a higher crosslinking density and the presence of crosslinks of higher functionality lead to a higher amount of energy released during the recovery-process, thus, increasing the work or the force released. Finally, an easy approach for the prediction of the work released by the shape-memory actuator has been proposed.
CitationBelmonte, A., Russo, C., Ambrogi, V., Fernandez-Francos, X., de la Flor, S. Epoxy-based shape-memory actuators obtained via dual-curing of off-stoichiometric \"thiol-epoxy\" mixtures. "Polymers", 21 Març 2017, vol. 9, núm. 3, p. 1-19. 
URIhttp://hdl.handle.net/2117/103893
DOI10.3390/polym9030113
ISSN2073-4360
Publisher versionhttp://www.mdpi.com/2073-4360/9/3/113
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  • POLTEPO - Polímers Termoestables Epoxídics - Articles de revista [107]
  • Departament de Màquines i Motors Tèrmics - Articles de revista [449]
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