Articles producció científica> Química Analítica i Química Orgànica

Phenomenological characterization of sequential dual-curing of off-stoichiometric “thiol-epoxy” systems: Towards applicability

  • Dades identificatives

    Identificador: imarina:6388878
    Autors:
    Belmonte, AlbertoFernandez-Francos, XavierSerra, AngelsDe la Flor, Silvia
    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.
  • Altres:

    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
  • Paraules clau:

    Materials Science (Miscellaneous),Materials Science, Multidisciplinary,Mechanical Engineering,Mechanics of Materials
    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
    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
  • Documents:

  • Cerca a google

    Search to google scholar