Effects of polymer structure on properties of sulfonated polyimide/protic ionic liquid composite membranes for nonhumidified fuel cell applications

ACS Applied Materials & Interfaces
Tomohiro YasudaMasayoshi Watanabe

Abstract

To investigate the effects of polymer structure on the properties of composite membranes including a protic ionic liquid, [dema][TfO] (diethylmethylammonium trifluoromethanesulfonate), for nonhumidified fuel cell applications, we synthesized sulfonated polyimides (SPIs) with different structures as matrix polymers, which have different magnitudes of ion-exchange capacities (IECs), different sequence distributions of ionic groups, and positions of sulfonate groups in the main chain or side chain. Despite having similar IECs, multiblock copolymer SPI and random copolymer SPI having sulfonate groups in the side chain exhibit higher ionic conductivity than random copolymer SPI having sulfonate groups in the main chain, indicating that the flexibility of sulfonic acid groups and the sequence distribution of ionic groups greatly affect the ion conduction. Atomic force microscopy observation revealed that the multiblock copolymer SPI forms more developed phase separation than the others. These results indicate that the flexibility of sulfonic acid groups and the connectivity of the ion conduction channel, which greatly depends on the sequence distribution, affect the ion conduction.

References

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Citations

Jun 7, 2013·ACS Applied Materials & Interfaces·Satoru ImaizumiMasayoshi Watanabe
Jul 17, 2013·ACS Applied Materials & Interfaces·Fei LuLiqiang Zheng
Oct 2, 2015·Chemical Reviews·Tamar L Greaves, Calum J Drummond
Oct 10, 2013·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Barbara MecheriSilvia Licoccia
Nov 29, 2013·ACS Applied Materials & Interfaces·Kai FengPeiyi Wu
Feb 5, 2014·ACS Applied Materials & Interfaces·Sa LiuBaolian Yi
Jan 14, 2017·Chemical Reviews·Masayoshi WatanabeKaoru Dokko
May 17, 2014·Chemical Communications : Chem Comm·M SmiglakR D Rogers
Sep 20, 2017·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Yuzo KitazawaMasayoshi Watanabe
Apr 12, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Gabriele G GagliardiAhmad El-Kharouf
Jun 3, 2021·International Journal of Molecular Sciences·Mohammad EbrahimiJoanna Kujawa
Jul 29, 2021·Soft Matter·P Logesh KumarMadivala G Basavaraj
Jul 7, 2020·The Journal of Physical Chemistry. B·Chung Bin Park, Bong June Sung
Sep 12, 2019·ACS Applied Materials & Interfaces·Ryan J FoxTheo J Dingemans

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