RT Journal Article
T1 Synthesis and characterization of benzimidazolium-functionalized polysulfones as anion-exchange membranes
A1 Pérez Prior, María Teresa
A1 Varez, Alejandro
A1 Levenfeld Laredo, Belén
AB Anion-exchange membranes containing pendant benzimidazolium groups were synthesized from polysulfone by chrolomethylation followed by nucleophilic substitution reaction with 1-methylbenzimidazole. The structures of the polymers were characterized by H-1-NMR and FTIR analysis. The resulting membranes showed high thermal stability below 200 degrees C. The values of water uptake and swelling degree increased with the ion-exchange capacity of the polymeric membrane. The ionic conductivity was measured by means of impedance spectroscopy in aqueous solution of potassium hydroxide (10(-4)-10(-1) M). The results show not only a clear correlation between the membrane's electrochemical behavior with the electrolyte solution embedded in the membrane, but also with the degree of the polysulfone's chloromethylation.Thus, the ionic conductivity increased more than two orders of magnitude when the degree of chloromethylation increased from 40 to 140%. Benzimidazolium-functionalized polysulfones exhibited better thermal, mechanical, and electrochemical properties than the widely used polymeric membranes containing quaternary ammonium groups.
PB Wiley Periodicals, Inc.
SN 0887-624X
SN 1099-0518 (online)
YR 2015
FD 2015-10-15
LK https://hdl.handle.net/10016/31226
UL https://hdl.handle.net/10016/31226
LA eng
NO This work has been supported by the Projects from the regional government (Comunidad de Madrid through MATERYENER3CM S2013/MIT-2753) and Spanish Government, MINECO (MAT2013‐46452‐C4‐3R).
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RD 27 jul. 2024