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Dielectric Properties in Oriented and Unoriented Membranes Based on Poly(Epichlorohydrin-co-Ethylene Oxide) Copolymers: Part III

  • Datos identificativos

    Identificador: imarina:9261345
    Handle: https://hdl.handle.net/20.500.11797/imarina9261345
    Autores:
    Pascual-Jose, BZare, AlirezaDe la Flor, SilviaAntonio Reina, JoseGiamberini, MRibes-Greus, A
    Resumen:
    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

  • Otros:

    Autor según el artículo: Pascual-Jose, B; Zare, Alireza; De la Flor, Silvia; Antonio Reina, Jose; Giamberini, M; Ribes-Greus, A
    Departamento: Enginyeria Mecànica Enginyeria Química Química Analítica i Química Orgànica
    Autor/es de la URV: De la Flor Lopez, Silvia / Giamberini, Marta / Reina Lozano, José Antonio / Zare, Alireza
    Código de proyecto: Grant agreement No. 713679
    Palabras clave: 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
    Resumen: 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.
    Áreas temáticas: Polymers and plastics Polymer science Odontología General chemistry Farmacia Engenharias ii Ciências biológicas ii Chemistry (miscellaneous) Chemistry (all) Biotecnología Astronomia / física
    Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
    Direcció de correo del autor: alireza.zare@urv.cat marta.giamberini@urv.cat joseantonio.reina@urv.cat silvia.delaflor@urv.cat
    Identificador del autor: 0000-0002-6981-8914 0000-0001-8278-3552 0000-0002-9245-4135 0000-0002-6851-1371
    Fecha de alta del registro: 2024-11-02
    Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
    Programa de financiación: Marie Skłodowska-Curie Actions - European Union's Horizon 2020 research and innovation programme
    URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
    Referencia al articulo segun fuente origial: Polymers. 14 (7): 1369-
    Referencia de l'ítem segons les normes 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
    Acrónimo: MFP
    Entidad: Universitat Rovira i Virgili
    Año de publicación de la revista: 2022
    Acción del progama de financiación: Martí i Franquès COFUND Doctoral Programme
    Tipo de publicación: Journal Publications

  • Palabras clave:

    Chemistry (Miscellaneous),Polymer Science,Polymers and Plastics
    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
    Polymers and plastics
    Polymer science
    Odontología
    General chemistry
    Farmacia
    Engenharias ii
    Ciências biológicas ii
    Chemistry (miscellaneous)
    Chemistry (all)
    Biotecnología
    Astronomia / física

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