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Oral presentation

Development of anion-exchange membranes by using crosslinked ETFE films

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Yamada, Koji*; Tanaka, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Preparation of anion-exchange membranes using ionizing radiation and their cell testing; Swelling-suppression effect due to crosslinking of ETFE base films

Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Yamada, Koji*; Tanaka, Hirohisa*

no journal, , 

We prepared anion-exchange membranes based on $$gamma$$-ray crosslinked ethylene-tetrafluoroethylene copolymer (ETFE) by $$gamma$$-ray-induced graft polymerization of chloromethylstyrene (CMS) and the subsequent quaternization reaction. Little effect of radiation crosslinking was observed for the degree of CMS grafting and the quaternization ratio. Interestingly, however, the crosslinking structure in ETFE was found to lower water uptake of the resulting membranes in the OH form, thereby restricting excessive swelling during hydrazine-fuel-cell operation.

Oral presentation

Development of anion-exchange ETFE membranes by radiation grafting

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*

no journal, , 

We prepared anion-exchange membranes based on an ethylene-tetrafluoroethylene copolymer by $$gamma$$-ray-induced graft polymerization of chloromethylstyrene (CMS) and the subsequent quaternization reaction. The crosslinker effect was investigated in terms of membrane preparation and performance of a hydrazine fuel cell. The quaternization ratio appeared to decrease as the concentration of divinylbenzene (DVB) in the CMS grafting solution increased. Importantly, the crosslinker lowered the water uptake of the resulting membranes in the Cl and OH forms, possibly thereby restricting excessive swelling during the fuel-cell operation.

Oral presentation

Fuel cell performance of anion exchange polymer electrolyte membranes prepared by radiation-induced grafting

Maekawa, Yasunari; Sinnananchi, W.; Koshikawa, Hiroshi; Yamaki, Tetsuya; Asano, Masaharu; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*

no journal, , 

Anion-exchange membranes (AEM) for hydrazine fuel cells, in which non precious metals are used as a electrode catalyst, were prepared using radiation techniques. The grafted AEM were prepared by the radiation-induced graft polymerization of chloromethylstyrene (CMS) into poly(ethylene-co-tetrafluoroethylene) (ETFE) films and subsequent quaternization of the grafts with trimethylamine. When the grafted AEM were treated in 1M-KOH and washed with N$$_{2}$$-saturated water, the membranes with chloride form (ETFE-TMAMS(Cl)) can be converted quantitatively to hydroxide form (ETFE-TMAMS(OH)) without the formation of the bicarbonate form. The grafted AEM with IEC of 2.0 mmol/g showed the maximum power density of more than 300 mW/cm$$^{2}$$ with stability for 400 hours under the operation at 80$$^{circ}$$C.

Oral presentation

Development of anion-exchange polymer electrolyte membranes by radiation techniques; Radiation-induced crosslinking and grafting

Yamaki, Tetsuya; Koshikawa, Hiroshi; Asano, Masaharu; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*

no journal, , 

We prepared new membrane materials by radiation techniques for application in alkaline fuel cells, especially in direct hydrazine fuel cells. Our unique method based on radiation-induced crosslinking and grafting, which previously proved to be an effective way of obtaining high-performance proton exchange membranes, has been used for developing anion-exchange membranes superior to those by the conventional radiation grafting. New attempts here were the $$gamma$$-ray crosslinking of the poly(ethylene-co-tetrafluoroethylene) base film and chloromethylstyrene grafting with addition of a chemical crosslinker, divinylbenzene. The crosslinked anion-exchange membranes exhibited high OH$$^{-}$$ conductivity in their fully hydrated state and low water uptake, implying practical usefulness of our method.

Oral presentation

Development of anion-exchange membranes by radiation grafting; Effect of crosslinker for swelling

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Shishitani, Hideyuki*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*

no journal, , 

no abstracts in English

Oral presentation

Development of anion-exchange membranes by radiation grafting technique

Asano, Masaharu; Koshikawa, Hiroshi; Yamaki, Tetsuya; Yoshimura, Kimio; Maekawa, Yasunari; Yamamoto, Kazuya*; Sampei, Fumihiro*; Shishitani, Hideyuki*; Asazawa, Koichiro*; Yamaguchi, Susumu*; et al.

no journal, , 

no abstracts in English

Oral presentation

Alkaline durable anion exchange membranes synthesized by radiation-induced grafting

Yoshimura, Kimio; Koshikawa, Hiroshi; Yamaki, Tetsuya; Sampei, Fumihiro*; Shishitani, Hideyuki*; Asazawa, Koichiro*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari

no journal, , 

no abstracts in English

8 (Records 1-8 displayed on this page)
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