Autor según el artículo: Roig, Adria; Ramis, Xavier; De la Flor, Silvia; Serra, Angels;

Departamento: Enginyeria Mecànica

Autor/es de la URV: De la Flor Lopez, Silvia / Serra Albet, Maria Angels

Palabras clave: Uv-curing Uv Thiol-epoxy Thiol-enes Thiol-ene Thermogravimetric analysis Thermal curing Tensile testing Systems Salts Photo-thermal Intermediate materials Homopolymerizations Glycidylmethacrylate Glycidyl methacrylate Epoxy Ene Dual-curing Dual curing Curing Crosslinking Composites Acrylic monomers

Resumen: In this work, a novel dual-curing procedure has been developed. It is a combination of a first radical UV-initiated thiol-(meth)acrylate reaction, followed by a second thermal thiol-epoxy step catalysed by a base. Since (meth) acrylates can lead to homopolymerization by radical mechanism, the amount of thiol has to be optimized to reach cross-linked materials with Tgs above room temperature and good mechanical performance. It should be considered, that if the amount of thiol in the intermediate materials is too low, epoxy homopolymerization can take place during the second step. The use of glycidyl methacrylate in combination with trifunctional meth (acrylates) allows this system to gel in the 1st stage and avoids possible dripping or exudation of free monomers during the storage of the intermediate materials. Moreover, this compound reacts in both stages acting as a covalent coupling between (meth)acrylates and epoxy networks. We selected trimethylolpropane tris(3mercaptopropionate) as the thiol, 2,2-dimethoxy-2-phenylacetophenone as UV initiator and 1-methylimidazole as the base catalyst. The curing evolution was studied by DSC and FTIR. All the materials obtained were characterized by thermogravimetry, thermomechanical analysis and tensile tests.

Áreas temáticas: Química Polymers and plastics Polymer science Organic chemistry Medicina ii Materials chemistry Materiais Interdisciplinar Farmacia Engenharias iv Engenharias iii Engenharias ii Ciências biológicas ii Ciências biológicas i Ciências agrárias i Biotecnología Astronomia / física

Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/

Direcció de correo del autor: silvia.delaflor@urv.cat angels.serra@urv.cat

Identificador del autor: 0000-0002-6851-1371 0000-0003-1387-0358

Fecha de alta del registro: 2023-02-19

Volumen de revista: 230

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

Enlace a la fuente original: https://www.sciencedirect.com/science/article/pii/S0032386121006960?via%3Dihub

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

Referencia al articulo segun fuente origial: Polymer. 230

Referencia de l'ítem segons les normes APA: Roig, Adria; Ramis, Xavier; De la Flor, Silvia; Serra, Angels; (2021). Sequential photo-thermal curing of (meth)acrylate-epoxy thiol formulations. Polymer, 230(), -. DOI: 10.1016/j.polymer.2021.124073

DOI del artículo: 10.1016/j.polymer.2021.124073

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2021

Tipo de publicación: Journal Publications