%0 Journal Article
%A Hamada, Takashi
%A Zhao, Yue
%A Yoshimura, Kimio
%A Radulescu, Aurel
%A Ohwada, Kenji
%A Maekawa, Yasunari
%T Hydrophobic Effect on Alkaline Stability of Graft Chains in Ammonium‐type Anion Exchange Membranes Prepared by Radiation‐Induced Graft Polymerization
%J ChemistrySelect
%V 6
%N 33
%@ 2365-6549
%C Weinheim
%I Wiley-VCH
%M FZJ-2021-03745
%P 8879 - 8888
%D 2021
%X 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 %.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000693218500049
%R 10.1002/slct.202102045
%U https://juser.fz-juelich.de/record/897357