Optimized step‐growth polymerization of water‐insoluble, highly sulfonated poly(phenylene sulfone)

Due to its potential for fuel cell applications, the synthesis of sulfonated poly(phenylene sulfone) with an ion‐exchange capacity (IEC) of 2.78 mequiv g−1 (sPPS‐360) is optimized and the effect of increased molecular weight on mechanical properties studied. The synthesis comprises the step‐growth p...

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Bibliographic Details
Published in:Polymers for advanced technologies 2022-07, Vol.33 (7), p.2336-2343
Main Authors: Katcharava, Zviad, Saatkamp, Torben, Muenchinger, Andreas, Dumbadze, Nodar, Kreuer, Klaus‐Dieter, Schuster, Michael, Titvinidze, Giorgi
Format: Article
Language:English
Subjects:
Chemical synthesis
Fuel cells
Hydrogen peroxide
ionomers
Mechanical properties
membranes
Molecular weight
Monomers
Optimization
Oxidation
Polymerization
Recrystallization
Reproducibility
Sodium sulfate
step‐growth polymerization
sulfonated polysulfones
Tensile tests
Water purification
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Summary:Due to its potential for fuel cell applications, the synthesis of sulfonated poly(phenylene sulfone) with an ion‐exchange capacity (IEC) of 2.78 mequiv g−1 (sPPS‐360) is optimized and the effect of increased molecular weight on mechanical properties studied. The synthesis comprises the step‐growth polymerization of sulfonated difluorodiphenylsulfone (sDFDPS) with thiobisbenzenethiol (TBBT), followed by an oxidation (via hydrogen peroxide). In the past, this procedure was marked by very low reproducibility and often limited achievable molecular weight. Sodium sulfate—a by‐product in the preparation of sDFDPS—is found to be retained throughout the monomer's established purification procedure via recrystallization from alcohol/water mixtures. The contamination is quantified by atomic absorption spectroscopy (AAS) and combustion analysis. At corrected monomer ratios, the preparation of sPPS‐360 is highly reproducible and a subsequent optimization of synthetic parameters yields a significant increase in number average molecular weight (typical Mn 15–30 kDa up to 154 kDa). Improved viscoelastic properties of optimized sPPS‐360s are evident in tensile tests at 30 %RH, better membrane‐forming properties and reduced water uptake (when submerged in water).
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.5688