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Sulfonated poly(naphthoylenebenzimidazole) and its modification with an alkali metal cation

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Abstract

A method for sulfonation of poly(naphthoylenebenzimidazole) with oleum–sulfuric acid mixture to produce sulfonated poly(naphthoylenebenzimidazole)s (SPNBIs) with different content of–SO3H groups has been developed. SPNBIs containing ≥5% sulfur are soluble in NMP and form stable solutions. It has been revealed that viscosity of SPNBI solutions in NMP increases on decreasing concentration when the content of polar sulfonic groups enhances with sulfonation degree of the initial polymer. Thus, SPNBI shows the polyelectrolyte effect. The substitution of hydrogen atoms in sulfonic groups by an alkali metal ion, potassium, has been conducted by the treatment of SPNBI powders with 5 M KOH aqueous solution under heterogeneous conditions. Potassium salts of SPNBI are insoluble in NMP. The introduction of potassium ions into SPNBI leads to the preparation of ionomers with a thermal stability higher than that of the initial PNBI.

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Authors and Affiliations

  1. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991, Russia

    M. I. Buzin, V. G. Vasil’ev, G. G. Nikiforova, N. M. Belomoina, E. G. Bulycheva & V. S. Papkov

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  1. M. I. Buzin
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  2. V. G. Vasil’ev
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  3. G. G. Nikiforova
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  4. N. M. Belomoina
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  5. E. G. Bulycheva
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  6. V. S. Papkov
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Correspondence to M. I. Buzin.

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Original Russian Text © M.I. Buzin, V.G. Vasil’ev, G.G. Nikiforova, N.M. Belomoina, E.G. Bulycheva, V.S. Papkov, 2016, published in Doklady Akademii Nauk, 2016, Vol. 471, No. 4, pp. 446–449.

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Buzin, M.I., Vasil’ev, V.G., Nikiforova, G.G. et al. Sulfonated poly(naphthoylenebenzimidazole) and its modification with an alkali metal cation. Dokl Phys Chem 471, 195–198 (2016). https://doi.org/10.1134/S0012501616120010

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  • DOI: https://doi.org/10.1134/S0012501616120010

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