Author, as appears in the article.: Konuray A., Ruiz A., Morancho J., Salla J., Fernández-Francos X., Serra À., Ramis X.

Department: Química Analítica i Química Orgànica

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

Keywords: Thermosets Michael addition Free-radical polymerization Dual-curing Crosslinking Click chemistry Acrylates Acrylate Acetoacetate

Abstract: A new family of poly(keto ester)-poly(methacrylate) thermosets based on off-stoichiometric acetoacetate-acrylate/methacrylate formulations has been prepared and characterized. The first stage of curing is a self-limiting click Michael addition between acetoacetate and acrylate groups at room temperature and the second stage is a methacrylate radical photopolymerization. An analysis of the reaction kinetics confirmed that acetoacetate reacts selectively with acrylates, leaving methacrylates completely unreacted after the first curing stage. It was found that acrylate-rich mixtures achieve complete conversion at the end of both curing stages. In methacrylate-rich formulations the dilution effect of this monomer leads to a slow curing rate and a certain amount of unreacted acrylates in the first curing stage, which react completely after irradiation in the second curing stage. The prepared materials are gelled after acetoacetate/acrylate Michael addition and show a wide range of properties at both curing stages that can be tailored by changing the relative contribution of the Michael and radical vinyl homopolymerization reactions. The latency of the formulations at the beginning of the second stage can be regulated as desired by irradiation.

Thematic Areas: Química Polymers and plastics Polymer science Physics and astronomy (miscellaneous) Physics and astronomy (all) Organic chemistry Odontología Materials chemistry Materiais Interdisciplinar General physics and astronomy Farmacia Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências ambientais Ciência de alimentos Ciência da computação Biotecnología Astronomia / física Arquitetura, urbanismo e design

ISSN: 00143057

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

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

Last page: 46

Record's date: 2023-02-18

Journal volume: 98

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

Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S0014305717304391

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

Papper original source: European Polymer Journal. 98 39-46

APA: Konuray A., Ruiz A., Morancho J., Salla J., Fernández-Francos X., Serra À., Ramis X. (2018). Sequential dual curing by selective Michael addition and free radical polymerization of acetoacetate-acrylate-methacrylate mixtures. European Polymer Journal, 98(), 39-46. DOI: 10.1016/j.eurpolymj.2017.11.003

Article's DOI: 10.1016/j.eurpolymj.2017.11.003

Entity: Universitat Rovira i Virgili

Journal publication year: 2018

First page: 39

Publication Type: Journal Publications