Author, as appears in the article.: Russo C; Fernandez-Francos X; De la Flor S

Department: Enginyeria Mecànica

URV's Author/s: De la Flor Lopez, Silvia / Fernández Francos, Xavier

Keywords: Thermosetting resins Shape-memory Recovery stress Dual-curing Actuator

Abstract: © BME-PT. In this work, new shape-memory thermosets have been developed using a thiol-acrylate-epoxy dual-curing system. A previously studied system has been successfully modified, introducing different amounts of tri(2,3-epoxypropyl)isocya-nurate (ISO) and bisphenol A glycerolate (1 glycerol/phenol) diacrylate (BAGA) in order to enhance the thermomechanical properties and the glass transition temperature of the final materials. Preliminary studies on the curing process proved that the curing process is not affected, and the critical ratio remains unchanged. Glass transition temperatures and thermome-chanical properties were successfully improved, extending the applicability of these thermosets to the field of soft-actuator. Shape-memory behavior was comprehensively investigated in unconstrained, fully and partially constrained conditions. Unconstrained experiment results showed excellent shape fixation and recovery, coupled with a fast recovery process. On the other hand, fully and partially constrained recovery experiments evidenced optimal performances obtained by the combination of both high crosslinking density and high deformability in the programming stage. Considerably high values of recovery stress (up to 7 MPa) and work output (up to 1300 kJ/m3) were found confirming the high potentiality of these dual-cured thermosets in the field of soft-actuation.

Thematic Areas: Química Polymers and plastics Polymer science Physical and theoretical chemistry Organic chemistry Odontología Materials chemistry Materiais Interdisciplinar General chemical engineering Farmacia Engenharias iv Engenharias iii Engenharias ii Ciências biológicas iii Ciências biológicas i Ciências ambientais Chemical engineering (miscellaneous) Chemical engineering (all) Biotecnología Astronomia / física

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 1788618X

Author's mail: xavier.fernandez@urv.cat silvia.delaflor@urv.cat

Author identifier: 0000-0002-3492-2922 0000-0002-6851-1371

Record's date: 2023-02-19

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: http://www.expresspolymlett.com/

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Express Polymer Letters. 15 (1): 58-71

APA: Russo C; Fernandez-Francos X; De la Flor S (2021). Shape-memory actuators based on dual-curing thiol-acrylate-epoxy thermosets. Express Polymer Letters, 15(1), 58-71. DOI: 10.3144/expresspolymlett.2021.7

Article's DOI: 10.3144/expresspolymlett.2021.7

Entity: Universitat Rovira i Virgili

Journal publication year: 2021

Publication Type: Journal Publications