Abstract
Membranes exhibiting proton conductivity have been prepared by sol-gel synthesis using tetraethoxysilane and heteroaromatic sulfonic acid derivatives (2-phenyl-5-benzimidazolesulfonic acid and 3-pyridinesulphonic acid) in the presence of phosphoric acid and polyvinyl butyral. The membranes are gels composed of a polyvinyl butyral polymer matrix with uniformly distributed particles of silica containing molecules of heteroaromatic sulfonic acid derivatives mechanically incorporated in its network structure. The membranes synthesized from 2-phenyl-5-benzimidazolesulfonic acid or 3-pyridinesulphonic acid exhibit a conductivity of 0.1 × 10−2 or 0.55 × 10−2 S/cm at 353 K, an ion-exchange capacity of 2.70 or 1.84 mequiv/g, and a proton-transfer activation energy of 24.93 or 21.73 kJ/mol, respectively; at a relative water content of 50%, the tensile strength is 4 or 6 MPa and the elastic modulus is 128 or 191 MPa, respectively.
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Original Russian Text © O.V. Lebedeva, A.N. Chesnokova, T.V. Badlueva, E.I. Sipkina, A.E. Rzhechitskii, Yu.N. Pozhidaev, 2015, published in Membrany i Membrannye Tekhnologii, 2015, Vol. 5, No. 2, pp. 87–93.
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Lebedeva, O.V., Chesnokova, A.N., Badlueva, T.V. et al. Hybrid ion-exchange membranes based on heteroaromatic sulfonic acid derivatives. Pet. Chem. 55, 333–338 (2015). https://doi.org/10.1134/S0965544115040040
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DOI: https://doi.org/10.1134/S0965544115040040