Ternary proton exchange membranes with low‐cost raw materials: Solvent type influence on microstructure development, high ionic conductivity, and ionic liquid lixiviation protection

ABSTRACT A critical stage of solvent evaporation during membrane casting was identified as responsible for significant differences in performance of ternary membranes composed of PEEK with 73% of sulfonation degree. DemaTfO and MmtdemaDMF showed to be the best solvent for casting of membranes prepar...

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Bibliographic Details
Published inJournal of applied polymer science Vol. 135; no. 16
Main Authors Rubio Arias, Jose Jonathan, Gomes, Ailton de Souza
Format Journal Article
LanguageEnglish
Published Hoboken Wiley Subscription Services, Inc 20.04.2018
Subjects
Electron microscopy
Ion currents
Ionic liquids
Ions
Leaching
Materials science
Membranes
Phase separation
Polarity
polyelectrolytes
Polymers
Raw materials
Solvents
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Summary:ABSTRACT A critical stage of solvent evaporation during membrane casting was identified as responsible for significant differences in performance of ternary membranes composed of PEEK with 73% of sulfonation degree. DemaTfO and MmtdemaDMF showed to be the best solvent for casting of membranes prepared through the present study, which is against the observations made through other different studies. Fractal structures are formed regardless of solvent polarity, and interlamellar spacing is found to be higher when DMF is used, which led to higher conductivity and IL leaching protection. Proton relaxometry showed that only the membranes made with DMF and DMAc possess one single mobility domain. Transmission electron microscopy micrographs showed a higher damage in membranes with two different mobility domains and consequent phase separation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46012.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.46012