Author, as appears in the article.: Zare A; Pascual-Jose B; De la Flor S; Ribes-Greus A; Montané X; Reina JA; Giamberini M

Department: Enginyeria Mecànica Enginyeria Química Química Analítica i Química Orgànica

URV's Author/s: De la Flor Lopez, Silvia / Giamberini, Marta / Montané Montané, Xavier / Reina Lozano, José Antonio / Zare, Alireza

Keywords: Wettability Transport properties Self-assembly Scanning electron microscopy Positive ions Polyepichlorohydrin Poly(epichlorohydrin-co-ethylene oxide) Methanol permeability Methanol Membranes Membrane transport Membrane orientation Membrane characterization Liquid-crystalline polymers Linear sweep voltammetry Field emission microscopes Ethylene oxides Ethylene Dynamic mechanical thermal analysis Dielectric thermal analysis Dendrons Crystalline polymeric wires Contact angle Cation-transport membranes Cation-exchange membrane Cation transports Cation exchange membranes wires wettability water tapered mesogenic groups self-assembly selective proton transport relaxation orientation methanol permeability membrane orientation linear sweep voltammetry ion-conducting membranes fuel-cells family ethylene-oxide dynamic mechanical thermal analysis dielectric thermal analysis design derivatives dendrons cation-transport membranes cation-exchange membrane

Abstract: Dendronized polyethers give rise to columnar LC structures which can successfully act as cation transport materials. Therefore, we prepared two different materials, based on Poly(epichlorohydrin-co-ethylene oxide) (PECH-co-EO) grafted with methyl 3,4,5-tris[4-(n-dodecan-1-yloxy)benzyloxy] benzoate, containing 20% or 40% modified units, respectively. The obtained polymers were characterized by differential scanning calorimetry (DSC), X-ray diffraction and optical microscopy between crossed polars (POM) and compared to the unmodified PECH-co-EO. In order to reach efficient transport properties, homeotropically oriented membranes were prepared by a fine-tuned thermal annealing treatment and were subsequently investigated by dynamic mechanical thermal analysis (DMTA) and dielectric thermal analysis (DETA). We found that the presence of the dendrons induces a main chain partial crystallization of the polyether chain and coherently increases the polymer Tg. This effect is more evident in the oriented membranes. As for copolymer orientation upon annealing, the cooling rate and the annealing temperature were the most crucial factors. DMTA and DETA confirmed that grafting with the dendron strongly hinders copolymer motions, but did not show great differences between unoriented and oriented membranes, regardless of the amount of dendrons.

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: xavier.montane@urv.cat silvia.delaflor@urv.cat joseantonio.reina@urv.cat marta.giamberini@urv.cat alireza.zare@urv.cat

Author identifier: 0000-0002-1426-239X 0000-0002-6851-1371 0000-0002-9245-4135 0000-0001-8278-3552 0000-0002-6981-8914

Record's date: 2023-06-17

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.mdpi.com/2073-4360/13/20/3532

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Polymers. 13 (20): 3532-

APA: Zare A; Pascual-Jose B; De la Flor S; Ribes-Greus A; Montané X; Reina JA; Giamberini M (2021). Membranes for cation transport based on dendronized poly(Epichlorohydrin-co-ethylene oxide). part 1: The effect of dendron amount and column orientation on copolymer mobility. Polymers, 13(20), 3532-. DOI: 10.3390/polym13203532

Article's DOI: 10.3390/polym13203532

Entity: Universitat Rovira i Virgili

Journal publication year: 2021

Publication Type: Journal Publications