High thermomechanical stability and ion-conductivity of anion exchange membranes based on quaternized modified poly(oxyndoleterphenylene)
| Autor: | J.A. Ávila-Niño, Victor H. Lara, Arturo Rico-Zavala, Karina S. Pérez, Jorge Cárdenas, Eugenia Aldeco-Pérez, Lilian I. Olvera, Rubén Gaviño, Luis Gerardo Arriaga |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics 02 engineering and technology Conductivity 010402 general chemistry Electrochemistry 01 natural sciences Direct methanol fuel cell Side chain Ion-conductivity chemistry.chemical_classification Ion exchange Organic Chemistry Cationic polymerization Polymer 021001 nanoscience & nanotechnology Anion exchange membranes lcsh:TP1080-1185 0104 chemical sciences Ether-free polymers Membrane lcsh:Polymers and polymer manufacture chemistry Chemical engineering Superacid 0210 nano-technology |
| Zdroj: | Polymer Testing, Vol 95, Iss, Pp 107092-(2021) |
| ISSN: | 0142-9418 |
| Popis: | Novel anion exchange membranes (AEMs) were synthesized by superacid-catalyzed step-growth polycondensation of isatine and p-terphenyl at room temperature. The materials obtained were functionalized by a highly efficient nucleophilic substitution reaction to introduce different cationic side chain lengths, this way, different degrees of functionality (DF) were achieved through modifying the molar ratios of the functionalization agent and the polymer precursor. The high solubility of the cationic polymers allowed NMR studies, additionally, the water uptake (WU), morphology, ion exchange capacity (IEC), ion-conductivity, thermal and mechanical stabilities were investigated. The membranes displayed high conductivities due to the well-defined structures and high phase segregation observed, the membrane with the longest pendant quaternary ammonium (QA) group had a conductivity of 118.7 mS cm−1 at 80 °C demonstrating its potential applicability in electrochemical devices in which ionic membranes were required. The novel AEMs were tested in a hydrogen fuel cell (HFC) and a direct methanol fuel cell (DMFC) observing high open circuit voltages (OCV) of about 1.03 V and 0.6 V for HFC and DMFC, respectively. These results are promising for fuel cells and different electrochemical devices, according to the ion conductivity observed, resistance and mechanical properties of the reported membranes. |
| Databáze: | OpenAIRE |
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