Autor segons l'article: Silvia De la Flor; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra
Departament: Química Analítica i Química Orgànica Enginyeria Mecànica
Autor/s de la URV: DE LA FLOR LOPEZ, SILVIA; Alberto Belmonte; Xavier Fernández-Francos; Àngels Serra
Paraules clau: Dual-curing Rheological analysis Thiol-epoxy
Resum: An extensive characterization of a sequential dual-curing system based on off-stoichiometric “thiol-epoxy” mixtures was carried out using thiol compounds of different functionality. The intermediate and final materials obtained after each curing stages at different thiol-epoxy ratios were studied by means of thermomechanical and rheological experiments. The storage and loss modulus and the loss factor tan δ were monitored during the curing process to analyse gelation and network structure build-up. The critical ratio for gelation was determined making use of the ideal Flory-Stockmayer theory and compared with experimental results. Intermediate materials obtained in the vicinity of the theoretical critical ratio did not have the mechanical consistency expected for partially crosslinked materials, did not retain their shape and even experienced undesired flow upon heating to activate the second curing reaction. The rheological results showed that the critical ratio is higher than the predicted value and that a softening during the second curing stage affects the shape-retention at this ratio. From the thermomechanical results, a wide range of intermediate and final materials with different properties and applicability can be obtained by properly choosing the thiol-epoxy ratio: from liquid-like to highly deformable intermediate materials and from moderately crosslinked (deformable) to highly crosslinked (brittle) final materials.
Grup de recerca: Grup d'Investigació en Enginyeria Computacional i Experimental
Àrees temàtiques: Enginyeria mecànica Ingeniería mecánica Mechanical engineering
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 0261-3069
Identificador de l'autor: 0000-0002-6851-1371; n/a; 0000-0002-3492-2922; 0000-0003-1387-0358
Data d'alta del registre: 2016-11-02
Pàgina final: 127
Volum de revista: 113
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2017
Pàgina inicial: 116
Tipus de publicació: Article Artículo Article
Repositori URV