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Epoxy-Based Shape-Memory Actuators Obtained via Dual-Curing of Off-Stoichiometric 'Thiol-Epoxy' Mixtures

  • Dades identificatives

    Identificador: imarina:5130891
    Autors:
    Belmonte, AlbertoRusso, ClaudioAmbrogi, VeronicaFernandez-Francos, XavierDe la Flor, Silvia
    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.
  • Altres:

    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: 2024-09-07
    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: https://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
  • Paraules clau:

    Chemistry (Miscellaneous),Polymer Science,Polymers and Plastics
    Unconstrained
    thiol–epoxy
    shape-memory polymer
    partially-constrained
    fully-constrained
    dual-curing
    click chemistry
    actuator
    Polymers and plastics
    Polymer science
    Odontología
    General chemistry
    Farmacia
    Engenharias ii
    Ciências biológicas ii
    Chemistry (miscellaneous)
    Chemistry (all)
    Biotecnología
    Astronomia / física
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