Author, as appears in the article.: Konuray O; Fernández-Francos X; Ramis X; Serra Á

Department: Enginyeria Mecànica

e-ISSN: 2073-4360

URV's Author/s: Fernández Francos, Xavier / Serra Albet, Maria Angels

Keywords: 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

Abstract: © 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.

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

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

ISSN: 20734360

Author's mail: xavier.fernandez@urv.cat angels.serra@urv.cat

Author identifier: 0000-0002-3492-2922 0000-0003-1387-0358

Record's date: 2023-02-18

Journal volume: 11

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

Link to the original source: https://www.mdpi.com/2073-4360/11/9/1408

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

Papper original source: Polymers. 11 (9):

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

Article's DOI: 10.3390/polym11091408

Entity: Universitat Rovira i Virgili

Journal publication year: 2019

Publication Type: Journal Publications