Hydrophobic Effect on Alkaline Stability of Graft Chains in Ammonium-type Anion Exchange Membranes Prepared by Radiation-Induced Graft Polymerization

Takashi Hamada*, Yue Zhao, Kimio Yoshimura, Aurel Radulescu, Kenji Ohwada, Yasunari Maekawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Vinylbenzyltrimethylammonium hydroxide (VBA) and styrene (St) cografted poly(ethylene-co-tetrafluoroethylene) anion exchange membranes (VBA/St-AEM) were prepared by the radiation-induced graft polymerization of chloromethylstyrene and St and sequential quaternization and anion exchange reactions. Increasing the St content in the grafts to 63 % resulted in a gradual 21 % and 34 % decrease in the conductivity and water uptake, respectively, compared to those in the VBA-homo-grafted AEM. AEMs with a higher St content (81 %) showed a 9 % and 18 % higher conductivity and water uptake, respectively. Small-angle neutron scattering showed that the sudden growth of “water puddles” consisting of water-rich nano-domains dispersed randomly in phase-separated hydrophilic ion channels enhanced the conductivity and water uptake. In the alkaline durability test of VBA/St-AEM in 1 M potassium hydroxide at 80 °C for 720 h, the loss of the conductivity was suppressed from 43 % to 8 %, when the St contents in the grafts were increased from 0 % to 63 %.

Original languageEnglish
Pages (from-to)8879-8888
Number of pages10
JournalChemistrySelect
Volume6
Issue number33
DOIs
Publication statusPublished - 2021 Sep 7
Externally publishedYes

Keywords

  • Alkaline durability
  • Anion-conducting electrolyte membrane
  • Poly(ethylene-co-tetrafluoroethylene)
  • Radiation-induced graft polymerization
  • Small-angle neutron scattering

ASJC Scopus subject areas

  • Chemistry(all)

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