Autor segons l'article: Belmonte, Alberto; Russo, Claudio; Ambrogi, Veronica; Fernandez-Francos, Xavier; De la Flor, Silvia
Departament: Enginyeria Mecànica
e-ISSN: 2073-4360
Autor/s de la URV: Fernández Francos, Xavier
Paraules clau: Unconstrained thiol–epoxy shape-memory polymer partially-constrained fully-constrained dual-curing click chemistry actuator
Resum: 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.
Àrees temàtiques: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 20734360
Adreça de correu electrònic de l'autor: xavier.fernandez@urv.cat
Identificador de l'autor: 0000-0002-3492-2922
Data d'alta del registre: 2023-02-18
Volum de revista: 9
Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
Enllaç font original: https://www.mdpi.com/2073-4360/9/3/113
URL Document de llicència: http://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Polymers. 9 (3):
Referència de l'ítem segons les normes APA: Belmonte, Alberto; Russo, Claudio; Ambrogi, Veronica; Fernandez-Francos, Xavier; De la Flor, Silvia (2017). Epoxy-Based Shape-Memory Actuators Obtained via Dual-Curing of Off-Stoichiometric 'Thiol-Epoxy' Mixtures. Polymers, 9(3), -. DOI: 10.3390/polym9030113
DOI de l'article: 10.3390/polym9030113
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2017
Pàgina inicial: 113
Tipus de publicació: Journal Publications
Repositori URV