Autor segons l'article: Belmonte, Alberto; Fernandez-Francos, Xavier; Serra, Angels; De la Flor, Silvia
Departament: Química Analítica i Química Orgànica Enginyeria Mecànica
Autor/s de la URV: De la Flor Lopez, Silvia / Fernández Francos, Xavier / Serra Albet, Maria Angels / Serra Masdeu, Anna Isabel Maria
Paraules clau: Thiol-epoxy Thermosets Thermo-mechanical analysis Temperature Rheological analysis Polymer Networks Michael addition Mechanical-properties Kinetics Functional materials Dual-curing Differential scanning calorimetry Click reaction Chemistry
Resum: © 2016 Elsevier Ltd 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.
Àrees temàtiques: Química Mechanics of materials Mechanical engineering Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) Materiais Matemática / probabilidade e estatística Interdisciplinar Geociências General materials science Engenharias iv Engenharias iii Engenharias ii Engenharias i Ciências agrárias i Ciência de alimentos Ciência da computação Astronomia / física Arquitetura e urbanismo
Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 18734197
Adreça de correu electrònic de l'autor: angels.serra@urv.cat xavier.fernandez@urv.cat annaisabel.serra@urv.cat silvia.delaflor@urv.cat
Identificador de l'autor: 0000-0003-1387-0358 0000-0002-3492-2922 0000-0001-9353-7154 0000-0002-6851-1371
Data d'alta del registre: 2024-11-02
Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
Enllaç font original: https://www.sciencedirect.com/science/article/abs/pii/S0264127516313004
URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
Referència a l'article segons font original: Materials & Design. 113 116-127
Referència de l'ítem segons les normes APA: Belmonte, Alberto; Fernandez-Francos, Xavier; Serra, Angels; De la Flor, Silvia (2017). Phenomenological characterization of sequential dual-curing of off-stoichiometric “thiol-epoxy” systems: Towards applicability. Materials & Design, 113(), 116-127. DOI: 10.1016/j.matdes.2016.10.009
DOI de l'article: 10.1016/j.matdes.2016.10.009
Entitat: Universitat Rovira i Virgili
Any de publicació de la revista: 2017
Tipus de publicació: Journal Publications