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: angels.serra@urv.cat silvia.delaflor@urv.cat
Author identifier: 0000-0003-1387-0358 0000-0002-6851-1371
Record's date: 2024-11-02
Papper version: info:eu-repo/semantics/publishedVersion
Licence document URL: https://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
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV