Autor según el artículo: Pascual-Jose B; De la Flor S; Serra A; Ribes-Greus A
Departamento: Enginyeria Mecànica Química Analítica i Química Orgànica
Autor/es de la URV: De la Flor Lopez, Silvia / Serra Albet, Maria Angels
Palabras clave: 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
Resumen: 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.
Áreas temáticas: Process chemistry and technology Polymers and plastics Polymer science Organic chemistry Materials science, multidisciplinary
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
Direcció de correo del autor: angels.serra@urv.cat silvia.delaflor@urv.cat
Identificador del autor: 0000-0003-1387-0358 0000-0002-6851-1371
Fecha de alta del registro: 2024-11-02
Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
Enlace a la fuente original: https://pubs.acs.org/doi/full/10.1021/acsapm.2c01543
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
Referencia al articulo segun fuente origial: Acs Applied Polymer Materials. 5 (2): 1125-1134
Referencia 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 del artículo: 10.1021/acsapm.2c01543
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2023
Tipo de publicación: Journal Publications