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Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy

  • Dades identificatives

    Identificador: imarina:9290105
    Autors:
    Pascual-Jose BDe la Flor SSerra ARibes-Greus A
    Resum:
    The dielectric spectra of the poly(thiourethane) network, HDI-S3, have been analyzed to know the nature and the cooperativity of each of the six dielectric processes observed. At low temperatures, γ1, γ2, and β dielectric relaxations were attributed to noncooperative local motions in the glassy state, in which apparent activation energies are 30, 36, and 60 kJ·mol-1, respectively. At higher temperatures, three dielectric relaxations are observed (αTg, α*, ρ). The αTg relaxation is attributed to the glass transition, and it is overlapped with the α∗ relaxation. The molecular origin of α∗ relaxation is associated with the bond exchange reaction. Finally, the ρ relaxation is ascribed to the heterogeneity of the sample although its origin is uncertain. The DC conductivity (σDC) is found to be an appropriate variable to analyze the bond exchange reaction. Accordingly, the HDI-S3 has a molecular exchange mechanism of dissociative nature.
  • Altres:

    Autor segons l'article: Pascual-Jose B; De la Flor S; Serra A; Ribes-Greus A
    Departament: Enginyeria Mecànica Química Analítica i Química Orgànica
    Autor/s de la URV: De la Flor Lopez, Silvia / Serra Albet, Maria Angels
    Paraules clau: Thermosets Poly(thiourethane) Molecular-dynamics Dielectric spectra Covalent adaptable networks Charge transfer mechanism Broadband dielectric spectroscopy vitrimers viscosity transition-temperature thermosets thermoset soft segmented polyurethanes relaxations polymers poly(thiourethane) mobility dielectric spectra charge transfer mechanism broadband dielectric spectroscopy
    Resum: The dielectric spectra of the poly(thiourethane) network, HDI-S3, have been analyzed to know the nature and the cooperativity of each of the six dielectric processes observed. At low temperatures, γ1, γ2, and β dielectric relaxations were attributed to noncooperative local motions in the glassy state, in which apparent activation energies are 30, 36, and 60 kJ·mol-1, respectively. At higher temperatures, three dielectric relaxations are observed (αTg, α*, ρ). The αTg relaxation is attributed to the glass transition, and it is overlapped with the α∗ relaxation. The molecular origin of α∗ relaxation is associated with the bond exchange reaction. Finally, the ρ relaxation is ascribed to the heterogeneity of the sample although its origin is uncertain. The DC conductivity (σDC) is found to be an appropriate variable to analyze the bond exchange reaction. Accordingly, the HDI-S3 has a molecular exchange mechanism of dissociative nature.
    Àrees temàtiques: Process chemistry and technology Polymers and plastics Polymer science Organic chemistry Materials science, multidisciplinary
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    Adreça de correu electrònic de l'autor: angels.serra@urv.cat silvia.delaflor@urv.cat
    Identificador de l'autor: 0000-0003-1387-0358 0000-0002-6851-1371
    Data d'alta del registre: 2024-11-02
    Versió de l'article dipositat: info:eu-repo/semantics/publishedVersion
    Enllaç font original: https://pubs.acs.org/doi/full/10.1021/acsapm.2c01543
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referència a l'article segons font original: Acs Applied Polymer Materials. 5 (2): 1125-1134
    Referència de l'ítem segons les normes APA: Pascual-Jose B; De la Flor S; Serra A; Ribes-Greus A (2023). Analysis of Poly(thiourethane) Covalent Adaptable Network through Broadband Dielectric Spectroscopy. Acs Applied Polymer Materials, 5(2), 1125-1134. DOI: 10.1021/acsapm.2c01543
    DOI de l'article: 10.1021/acsapm.2c01543
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2023
    Tipus de publicació: Journal Publications
  • Paraules clau:

    Materials Science, Multidisciplinary,Organic Chemistry,Polymer Science,Polymers and Plastics,Process Chemistry and Technology
    Thermosets
    Poly(thiourethane)
    Molecular-dynamics
    Dielectric spectra
    Covalent adaptable networks
    Charge transfer mechanism
    Broadband dielectric spectroscopy
    vitrimers
    viscosity
    transition-temperature
    thermosets
    thermoset
    soft
    segmented polyurethanes
    relaxations
    polymers
    poly(thiourethane)
    mobility
    dielectric spectra
    charge transfer mechanism
    broadband dielectric spectroscopy
    Process chemistry and technology
    Polymers and plastics
    Polymer science
    Organic chemistry
    Materials science, multidisciplinary
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