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Chemically Stable Sulfonated Polytriazoles Containing Trifluoromethyl and Phosphine Oxide Moieties for Proton Exchange Membranes
journal contribution
posted on 2020-06-23, 01:43 authored by Arijit Ghorai, Sambit Roy, Sovik Das, Hartmut Komber, Makarand M. Ghangrekar, Brigitte Voit, Susanta BanerjeePolytriazoles are considered as an excellent high-performance polymer
due to their outstanding set of properties. The current investigation
reports the synthesis of a phosphorus-containing fluorinated diazide
monomer, that is, bis[4-(4′-azidophenoxy)-3-trifluoromethyl
phenyl] phenylphosphine oxide (PFAZ) and utilization of this compound
to synthesize a set of trifluoromethyl groups and phosphine oxide
containing sulfonated polytriazoles (PTPFBSH-XX). The copolymers with
a different level of sulfonation (-XX = −60, −70, −80,
−90) were prepared by the Cu(I) catalyst-assisted click reaction
of equimolar amounts of a dialkyne (BPALK) and a mixture of diazides
having one sulfonated diazide (DSAZ) and PFAZ. The polymers were further
characterized by NMR (1H, 13C, 19F, and 31P) and FTIR spectroscopy. Freestanding membranes
were attained from the dissolved copolymers solution in DMSO by standard
solution casting route. The membranes showcased acceptable thermal
and mechanical stabilities, excellent water management with a high
proton conductivity, and outstanding oxidative stability. SAXS, TEM,
AFM, and cross-sectional FE-SEM studies of the membranes indicated
phase-separated morphology. The oxidative stabilities of the membranes
ranged over 18 h. The polytriazole PTPFBSH-90 (PFAZ/DSAZ/BPALK = 10:90:100,
where the degree of sulfonation is 90%) having a weight-based ion
exchange capacity (IECW) of 2.39 mequiv g–1 exhibited a high proton conductivity of 142 mS cm–1 under hydrated conditions at 90 °C. Furthermore, PTPFBSH-XX
polymer membranes displayed a comparable performance in microbial
fuel cell as Nafion117. The chemical oxygen demand removal results
indicated that the polymeric membranes could be sustainable in bioelectrochemical
systems.
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BPALKstabilityweight-based ion exchange capacityPFAZPhosphine Oxide MoietiesAFMPTPFBSH-XX polymer membranesFTIRTEMdiazideIECNMRpolytriazole PTPFBSH -90Proton Exchange Membranes PolytriazolesChemically Stable Sulfonated Polytriazoles Containing Trifluoromethylproton conductivityFE-SEMDSAZchemical oxygen demand removal resultsSAXSDMSO
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