Articles producció científica> Química Analítica i Química Orgànica

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

  • Identification data

    Identifier: imarina:9290105
  • Authors:

    Pascual-Jose, B
    de la Flor, S
    Serra, A
    Ribes-Greus, A
  • Others:

    Author, as appears in the article.: Pascual-Jose, B; de la Flor, S; Serra, A; Ribes-Greus, A
    Department: Enginyeria Mecànica Química Analítica i Química Orgànica
    URV's Author/s: De la Flor Lopez, Silvia / Serra Albet, Maria Angels
    Keywords: 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
    Abstract: 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.
    Thematic Areas: Process chemistry and technology Polymers and plastics Polymer science Organic chemistry Materials science, multidisciplinary
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: silvia.delaflor@urv.cat angels.serra@urv.cat
    Author identifier: 0000-0002-6851-1371 0000-0003-1387-0358
    Record's date: 2023-12-17
    Papper version: info:eu-repo/semantics/publishedVersion
    Link to the original source: https://pubs.acs.org/doi/full/10.1021/acsapm.2c01543
    Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Acs Applied Polymer Materials. 5 (2): 1125-1134
    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
    Article's DOI: 10.1021/acsapm.2c01543
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2023
    Publication Type: Journal Publications
  • Keywords:

    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
  • Documents:

  • Cerca a google

    Search to google scholar