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Synthesis and Properties of Ion-Exchange Membranes Based on Porous Polytetrafluoroethylene and Sulphonated Polystyrene

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Abstract

Novel ion-exchange membranes based on a commercial porous polytetrafluoroethylene film and sulfonated polystyrene are synthesized. To form porous polytetrafluoroethylene–polystyrene composites, thermal polymerization of styrene sorbed in the pores of the matrix-film from the monomer solution is used. The use of porous matrix makes it possible effectively obtaining the composites, used as precursors of the ion-exchange membranes. The sulfonating of the porous polytetrafluoroethylene–polystyrene composites forms the membranes with ion-exchange capacity up to 2.8 mmol/g. The composition and ground physicochemical properties of the new proton-conducting composite membranes are investigated. The developed membranes were shown to have good transport properties. The proton conductivity of water-saturated membranes is as high as 0.13 S/cm at room temperature; the hydration number is 30. Comparative tests of the synthesized membranes and the commercial Nafion-115 membrane in a direct methanol fuel cell at 60°C showed the characteristics of the fuel cell with the developed membranes being at least not inferior to those of a Nafion-115-based cell.

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ACKNOWLEDGMENTS

In this work, we used resources of the Competence Center on the novel and mobile power sources and Analytical Center of collective using, the Institute of Problems of Chemical Physics, RAS.

Funding

This work was financially supported by the Russian Science Foundation (project no. 17-79-30054) and the state target topics (reg. nos. AAAA-A19-119061890019-5 and AAAA-A18-118112290069-6).

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    K. S. Novikova, E. A. Sanginov & Yu. A. Dobrovol’skii

  2. Branch of Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia

    E. F. Abdrashitov, D. A. Kritskaya & A. N. Ponomarev

Authors
  1. K. S. Novikova
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  2. E. F. Abdrashitov
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  3. D. A. Kritskaya
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  4. A. N. Ponomarev
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  5. E. A. Sanginov
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  6. Yu. A. Dobrovol’skii
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Corresponding author

Correspondence to D. A. Kritskaya.

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The authors declare that they have no conflict of interest.

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Translated by Yu. Pleskov

Based on the materials of the report at the 15th International Meeting “Fundamental Problems of Solid State Ionics”, Chernogolovka, 30.11.–07.12.2020.

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Novikova, K.S., Abdrashitov, E.F., Kritskaya, D.A. et al. Synthesis and Properties of Ion-Exchange Membranes Based on Porous Polytetrafluoroethylene and Sulphonated Polystyrene. Russ J Electrochem 57, 1047–1054 (2021). https://doi.org/10.1134/S1023193521100116

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  • DOI: https://doi.org/10.1134/S1023193521100116

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