TY  - JOUR
AU  - Hamada, Takashi
AU  - Zhao, Yue
AU  - Yoshimura, Kimio
AU  - Radulescu, Aurel
AU  - Ohwada, Kenji
AU  - Maekawa, Yasunari
TI  - Hydrophobic Effect on Alkaline Stability of Graft Chains in Ammonium‐type Anion Exchange Membranes Prepared by Radiation‐Induced Graft Polymerization
JO  - ChemistrySelect
VL  - 6
IS  - 33
SN  - 2365-6549
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-03745
SP  - 8879 - 8888
PY  - 2021
AB  - 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 %.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000693218500049
DO  - DOI:10.1002/slct.202102045
UR  - https://juser.fz-juelich.de/record/897357
ER  -