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Quaternized poly(styrene-co-vinylbenzyl chloride) anion exchange membranes: role of different ammonium cations on structural, morphological, thermal and physio-chemical properties

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Abstract

Different ammonium cation containing anion exchange membranes are investigated in this study. Anion exchange polymers have been prepared from styrene and vinylbenzyl chloride monomers by free radical polymerization, followed by a quaternization process. Amines such as trimethylamine (TMA), tris(trimethylsilyl)amine (TTSA), hexamine (HMA), N,N,N′,N′-tetramethyl hexanediamine (TMHDA), and N,N,N′,N′-tetramethyl ethylenediamine (TMEDA) are used in this study. FT-IR and 13C-NMR results confirm the successful quaternization of the co-polymers with different amines. TGA results reveal that the thermal stability of the anion exchange polymers is as high as 165 °C. SEM images show that the membrane morphological features are tuned by the different ammonium cations. The ionic conductivity, ion-exchange capacity and water uptake values of the membranes also change with the different ammonium cations, which reveal the distinctive roles of the different amines used. Among the membranes, the membrane containing the trimethylammonium (TMA+) cation demonstrates the highest ionic conductivity, ion-exchange capacity and water uptake. On the other hand, the hexaminium (HMA+) containing anion exchange membrane displays the lowest ionic conductivity, ion-exchange capacity and water uptake due to the highly entangled structure of the polymer caused by the cross-linking of the polymer units.

Graphical abstract: Quaternized poly(styrene-co-vinylbenzyl chloride) anion exchange membranes: role of different ammonium cations on structural, morphological, thermal and physio-chemical properties

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Publication details

The article was received on 15 Jul 2017, accepted on 21 Nov 2017 and first published on 22 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ02574B
Citation: New J. Chem., 2018, Advance Article
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    Quaternized poly(styrene-co-vinylbenzyl chloride) anion exchange membranes: role of different ammonium cations on structural, morphological, thermal and physio-chemical properties

    J. S., H. S., V. S. and S. G., New J. Chem., 2018, Advance Article , DOI: 10.1039/C7NJ02574B

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