Sulfonated aromatic copoly(ether–amide) membranes II
| Autor: | Ramón del Jesús Palí-Casanova, Manuel Aguilar-Vega, Yamile Pérez-Padilla, María Isabel Loría-Bastarrachea, Wadi Elim Sosa-González, José Luis Santiago-García |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry Ether 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chain length chemistry.chemical_compound Membrane chemistry Amide Polymer chemistry Materials Chemistry Cation-exchange capacity Organic chemistry Ionic conductivity 0210 nano-technology |
| Zdroj: | High Performance Polymers. 30:437-445 |
| ISSN: | 1361-6412 0954-0083 |
| DOI: | 10.1177/0954008317699863 |
| Popis: | Several aromatic sulfonated copoly(ether–amide)s, based on the aromatic diamines 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)-dianiline (HFD) and 2,4-diaminobenzensulfonic acid (DABS) and 4,4′-oxybis(benzoic acid) (OBA), were synthesized through a polycondensation reaction. The sulfonation degree was controlled by introducing different concentrations of 2,4-DABS from 40 mol% up to 80 mol%. Proton nuclear magnetic resonance validated the expected concentrations of sulfonic acid groups in the sulfonated aromatic copoly(ether–amide)s. Thermal decomposition of sulfonic groups was found to initiate at 280°C, while main chain decomposition initiates at 410°C. Proton conductivity between 30°C and 75°C was 19.0 and 45.0 mS/cm, respectively, for the copolymer with the highest concentration of sulfonic groups (–SO3H). Comparison with structurally similar sulfonated copolyamides and copoly(ether–amide)s indicates that these new sulfonated copoly(ether–amide)s based on 4,4′-OBA show improved mechanical properties, but a decrease in ion exchange capacity and proton conductivity. |
| Databáze: | OpenAIRE |
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