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Kodaira, Takahide; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*
no journal, ,
In the thermochemical water splitting IS process, the Bunsen reaction (SO
+ I + 2HO = HSO
+ 2HI) needs to be achieved in an electrochemical cell with an ion exchange membrane, which renders separation procedures unnecessary. As part of a JST-ALCA project, therefore, we have been developing ion exchange membranes for this application by using methods of radiation crosslinking and/or radiation graft polymerization. Our preliminary experiments made it possible to confirm controllability of the degree of grafting, 
, ion exchange capacity by varying the conditions of the grafting.
Kodaira, Takahide; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*
no journal, ,
In the thermochemical water splitting IS process, the Bunsen reaction (SO + I + 2HO = HSO + 2HI) needs to be achieved in an electrochemical cell with an ion exchange membrane, which renders separation procedures unnecessary. As part of a JST-ALCA project, therefore, we have been developing ion exchange membranes for this application by using methods of radiation crosslinking and/or radiation graft polymerization. Our preliminary experiments made it possible to confirm controllability of the degree of grafting, , ion exchange capacity by varying the conditions of the grafting. Importantly, controlling the fixed-charge density of the membrane should both lower permeability of SO and enhance the transport number of H
.
Kodaira, Takahide*; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Oura, Kotone*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*
no journal, ,
There has been a strong motivation to develop new cation exchange membranes suitable for the Bunsen reaction in the thermochemical water splitting IS process. We prepared cation exchange membranes by a radiation grafting polymerization method. The grafting reaction into a poly(ethylene-
-tetrafluoroethylene) film was performed in a mixture of styrene and divinylbenzene (DVB). The membrane had an ion exchange capacity of 2.17 mmol g
while Nafion212 possessed 0.90 mmol g that is less than half of that for the grafted membrane. Both these membranes exhibited a similar water uptake, but the grafted membrane showed lower water permeation than Nafion212.
Kodaira, Takahide*; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Oura, Kotone*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*
no journal, ,
In the thermochemical water splitting IS process, the Bunsen reaction (SO + I + 2HO = HSO + 2HI) needs to be achieved in an electrochemical cell with an ion exchange membrane, which renders separation procedures unnecessary. As part of a JST-ALCA project, therefore, we have been developing ion exchange membranes for this application by radiation-induced graft polymerization. The water permeation of the grafted membrane was lower than that of Nafion 212 under the condition of a similar water uptake.
Kodaira, Takahide*; Ikeda, Ayumi*; Matsuyama, Emi*; Kono, Nobuho*; Oura, Kotone*; Sawada, Shinichi; Yamaki, Tetsuya; Nomura, Mikihiro*
no journal, ,
In the thermochemical water splitting IS process, the Bunsen reaction (SO + I + 2HO = HSO + 2HI) needs to be achieved in an electrochemical cell with an ion exchange membrane. As part of an ongoing JST-ALCA project, therefore, we developed ion exchange membranes for this reaction by radiation-induced graft polymerization, investigating their water permeation properties by the pervaporation method. Our membrane preparation involves the 
-ray-induced grafting of styrene and divinylbenzene into poly(ethylene--tetrafluoroethylene) films and the subsequent sulfonation. Water permeate flux values at 25
C were 7.4 and 19 kg/m
h through the grafted membrane and Nafion 212 at the same water uptake (37%), respectively.