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: silvia.delaflor@urv.cat angels.serra@urv.cat
Identificador de l'autor: 0000-0002-6851-1371 0000-0003-1387-0358
Data d'alta del registre: 2023-12-17
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: http://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
Repositori URV