Autor según el artículo: Konuray O; Fernández-Francos X; Ramis X; Serra Á

Departamento: Enginyeria Mecànica

e-ISSN: 2073-4360

Autor/es de la URV: Fernández Francos, Xavier / Serra Albet, Maria Angels

Palabras clave: Thiol-acrylate Photopolymerization Networks Michael addition Kinetics Free-radical polymerization Epoxy thermosets Dual-curing Divinyl sulfone Click chemistry Acrylate Acetoacetate michael addition divinyl sulfone click chemistry acrylate acetoacetate

Resumen: © 2019 by the authors. Anovel set of dual-curable multiacetoacetate-multiacrylate-divinyl sulfone ternary materials with versatile and manipulable properties are presented. In contrast to common dual-curing systems, the first stage polymer herein consists of a densely crosslinked, high Tg network as a result of base-catalyzed multiacetoacetate-divinyl sulfone Michael addition. A more flexible secondary network forms after base-catalyzed Michael addition of remaining multiacetoacetate to multiacrylate. Curing is truly sequential as the rates of the two Michael additions are significantly different. Curing kinetics were analyzed using differential scanning calorimetry (DSC) and Fourier-transform infrared (FTIR). The materials at each curing stage were characterized using dynamic mechanical analysis (DMA) and SEM. Although some phase separation was observed in certain formulations, the incompatibilities were minimized when the molar percentage of the acetoacetate-divinyl sulfone polymer network was above 75%. Furthermore, the environmental scanning electron microscopy (ESEM) images of these materials show that the more flexible acetoacetate-acrylate phase is dispersed in the form of polymeric spheres within the rigid acetoacetate-divinyl sulfone matrix. This unique dual microstructure can potentially render these materials highly resilient in applications requiring densely crosslinked polymer architectures with enhanced toughness.

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 angels.serra@urv.cat

Identificador del autor: 0000-0002-3492-2922 0000-0003-1387-0358

Fecha de alta del registro: 2023-02-18

Volumen de revista: 11

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

Enlace a la fuente original: https://www.mdpi.com/2073-4360/11/9/1408

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

Referencia al articulo segun fuente origial: Polymers. 11 (9):

Referencia de l'ítem segons les normes APA: Konuray O; Fernández-Francos X; Ramis X; Serra Á (2019). Acetoacetate based thermosets prepared by dual-Michael addition reactions. Polymers, 11(9), -. DOI: 10.3390/polym11091408

DOI del artículo: 10.3390/polym11091408

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2019

Tipo de publicación: Journal Publications