Autor según el artículo: Belmonte, Alberto; Russo, Claudio; Ambrogi, Veronica; Fernandez-Francos, Xavier; De la Flor, Silvia

Departamento: Enginyeria Mecànica

e-ISSN: 2073-4360

Autor/es de la URV: Fernández Francos, Xavier

Palabras clave: Unconstrained thiol–epoxy shape-memory polymer partially-constrained fully-constrained dual-curing click chemistry actuator

Resumen: 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.

Áreas temáticas: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 20734360

Direcció de correo del autor: xavier.fernandez@urv.cat

Identificador del autor: 0000-0002-3492-2922

Fecha de alta del registro: 2023-02-18

Volumen de revista: 9

Versión del articulo depositado: info:eu-repo/semantics/publishedVersion

Enlace a la fuente original: https://www.mdpi.com/2073-4360/9/3/113

URL Documento de licencia: http://repositori.urv.cat/ca/proteccio-de-dades/

Referencia al articulo segun fuente origial: Polymers. 9 (3):

Referencia 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 del artículo: 10.3390/polym9030113

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2017

Página inicial: 113

Tipo de publicación: Journal Publications