Author, as appears in the article.: Pascual-Jose, B; Zare, Alireza; De la Flor, Silvia; Antonio Reina, Jose; Giamberini, M; Ribes-Greus, A
Department: Enginyeria Mecànica Enginyeria Química Química Analítica i Química Orgànica
URV's Author/s: De la Flor Lopez, Silvia / Giamberini, Marta / Reina Lozano, José Antonio / Zare, Alireza
Project code: Grant agreement No. 713679
Keywords: Segmental dynamics Poly(epichlorohydrin-co-ethylene oxide) Macromolecular cooperativity Electrical and protonic conductivity Dielectric relaxation spectra Crystalline polymeric wires Broadband dielectric spectroscopy selective proton transport segmental dynamics relaxation poly(epichlorohydrin-co-ethylene oxide) macromolecular cooperativity ion-conducting membranes family electrical and protonic conductivity dielectric relaxation spectra design derivatives composite membranes
Abstract: The dielectric spectra and conductivity properties of neat poly(epichlorohydrin-co-eth-ylene oxide)(PECH-co-EO) copolymer and two modified copolymers with a 20% or 40% of dendron 3,4,5-tris[4-(n-dodecan-1-yloxy)benzyloxy] benzoate units were analysed. A process of thermal orientation was applied to the copolymers to fine-tune the molecular motion of the side chains and determine their validity for cation transport materials. The study was conducted using Dielectric Thermal Analysis (DETA). The spectra of the modified unoriented and oriented copolymers con-sisted of five dielectric relaxations (δ, γ, β, αTg, and αmelting). The analysis of the relaxations processes shows that as the grafting with the dendron units increases, both the lateral and main chains have a greater difficulty moving. The thermal orientation induces in the main chain partial crystalliza-tion, including the polyether segments, and modifies the cooperative motion of the main chain as-sociated with the glass transition (αTg). A deep analysis of the electrical loss modulus revealed that the degree of modification only modifies the temperature peak of each relaxation, and this effect is more perceived if the dendron unit content is higher (40%). The thermal orientation process seems equal to the spectra of CP20-O and CP40-O to the point that the degree of modification does not matter. Nevertheless, the fragility index denotes the differences in the molecular motion between both copolymers (40% and 20%) due to the thermal orientation. The study of the electric conductivity showed that the ideal long-range pathways were being altered by neither the thermal orientation process nor the addition of dendrimers. The analysis of the through-plane proton conductivity confirmed that the oriented copolymer with the highest concentration of dendrimers was the best per-former and the most suitable copolymer for proton transport materials.
Thematic Areas: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: alireza.zare@urv.cat marta.giamberini@urv.cat joseantonio.reina@urv.cat silvia.delaflor@urv.cat
Author identifier: 0000-0002-6981-8914 0000-0001-8278-3552 0000-0002-9245-4135 0000-0002-6851-1371
Record's date: 2024-11-02
Papper version: info:eu-repo/semantics/publishedVersion
Funding program: Marie Skłodowska-Curie Actions - European Union's Horizon 2020 research and innovation programme
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Polymers. 14 (7): 1369-
APA: Pascual-Jose, B; Zare, Alireza; De la Flor, Silvia; Antonio Reina, Jose; Giamberini, M; Ribes-Greus, A (2022). Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III. Polymers, 14(7), 1369-. DOI: 10.3390/polym14071369
Acronym: MFP
Entity: Universitat Rovira i Virgili
Journal publication year: 2022
Funding program action: Martí i Franquès COFUND Doctoral Programme
Publication Type: Journal Publications
Repositori URV