Author, as appears in the article.: Montane, Xavier; Graf, Robert; Pascual-Jose, Borja; Teruel-Juanes, Roberto; Guardia, Jordi; Giamberini, Marta; Reina, Jose Antonio; Ribes-Greus, Amparo
Department: Química Analítica i Química Orgànica
URV's Author/s: Giamberini, Marta / Guardià Blanch, Jordi / Montané Montané, Xavier / Reina Lozano, José Antonio
Keywords: Benzoate spacers Biomimetic membranes Columnar mesophases Derivatives Design Dielectric relaxation spectr Dielectric relaxation spectra Dynamic molecular mobility Famil Ion-conducting membranes Polymers Side chain liquid crystalline polyamines Transport
Abstract: Dendronized polymers are suitable candidates for the preparation of biomimetic membranes for ion transport in fuel cells, which is nowadays a sustainable way of producing electrical energy. To prepare materials for these high-technology applications, it is necessary to understand the role of the different parts that make up these supramolecular structures. Another key factor is optimizing the preparation processes to ensure the materials achieve their maximum performance potential. Following these premises, in this work we report on the characterization of side chain liquid crystalline polyamines synthesized by chemical modification of poly[2-(aziridin1-yl)ethanol] (PAZE) with lateral benzoate groups and the dendron 3,4,5-tris[4-(n-dodecan-1-yloxy)benzyloxy] benzoate (TAP) by using the following techniques: liquid and solid-state Nuclear Magnetic Resonance (NMR), Differential Scanning Calorimetry (DSC), Polarized Optical Microscopy (POM) and Dielectric Thermal Analysis (DETA). This in-depth investigation allowed us to understand the effect of parameters that could influence the organization of the different parts of the resulting supramolecular structures and their dynamics: introduction of benzoate lateral spacers, grafting with different amounts of TAP mesogenic group, and the thermal treatment used in the orientation of the polymer chains. NMR investigations confirmed that the melting of both copolyamines took place thanks to the mobility gained by the aliphatic tails of the TAP dendron between 256 and 272 K. Furthermore, the evaluation of variable temperature 13 C solid-state NMR experiments proved that the clearing transition was related to the aromatic moieties of these polyamines. DETA studies of oriented and non-oriented membranes corroborated that the application of the thermal treatment increased the temperatures of the detected transitions: gamma- relaxation, alpha Tg and alpha Clear . The results obtained demonstrated that the adjustment of the aforementioned parameters is essential for designing membranes intended for ion transport applications.
Thematic Areas: Astronomia / física Biotecnología Ciência de alimentos Ciências agrárias i Ciências ambientais Ciências biológicas iii Engenharias i Engenharias ii Engenharias iii Engenharias iv Interdisciplinar Materiais Materials science, characterization & testing Medicina i Medicina ii Odontología Organic chemistry Polymer science Polymers and plastics Química
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: joseantonio.reina@urv.cat marta.giamberini@urv.cat jordi.guardia@alumni.urv.cat xavier.montane@urv.cat
Author identifier: 0000-0002-9245-4135 0000-0001-8278-3552 0000-0003-1345-3140 0000-0002-1426-239X
Record's date: 2025-02-24
Paper version: info:eu-repo/semantics/publishedVersion
Paper original source: Polymer Testing. 142 108658-
APA: Montane, Xavier; Graf, Robert; Pascual-Jose, Borja; Teruel-Juanes, Roberto; Guardia, Jordi; Giamberini, Marta; Reina, Jose Antonio; Ribes-Greus, Ampar (2025). Molecular mobility and dielectric properties of dendronized side chain liquid crystalline polyamines with benzoate groups as lateral spacers. Polymer Testing, 142(), 108658-. DOI: 10.1016/j.polymertesting.2024.108658
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2025
Publication Type: Journal Publications
Repositori URV