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Zhao, Y.; Yoshimura, Kimio; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Koizumi, Satoshi*; Szekely, N.*; Radulescu, A.*; Richter, D.*; Maekawa, Yasunari
Soft Matter, 12(5), p.1567 - 1578, 2016/02
Times Cited Count：27 Percentile：79.79(Chemistry, Physical)Yamaki, Tetsuya; Kobayashi, Kazuhiro; Asano, Masaharu; Kubota, Hitoshi*; Yoshida, Masaru
Polymer, 45(19), p.6569 - 6573, 2004/09
Times Cited Count：56 Percentile：82.78(Polymer Science)We prepared proton exchange membranes by the 
-ray-induced post grafting of styrene into crosslinked polytetrafluoroethylene (PTFE) films and subsequent sulfonation. The degree of grafting was controlled in the range of 7-75% by the crosslinking density of the PTFE matrix as well as the grafting conditions. Under our preparation conditions, the films at the grafting yield of 
30% were found to produce ion exchange membranes with a homogeneous distribution of sulfonic acid groups. The resulting membranes showed a large ion exchange capacity up to 2.9 meq g
, which exceeded the performance of commercially-available perfluorosulfonic acid films such as Nafion; nevertheless, they appeared to be dimensionally stable in water. These should undoubtedly result from the use of the crosslinked PTFE films as graft substrates and make our ion exchange membranes promising for applications to polymer electrolyte fuel cells.
Arifal; Hwang, G.; Onuki, Kaoru
Journal of Membrane Science, 210(1), p.39 - 44, 2002/12
Times Cited Count：19 Percentile：59.83(Engineering, Chemical)no abstracts in English
-ray sources simulating skin contaminationYoshida, Makoto;
Hoken Butsuri, 28, p.187 - 193, 1993/00
no abstracts in English
-ray dose calibration sources in skin contamination measurementYoshida, Makoto; Murakami, Hiroyuki;
Proc. of the Int. Radiation Protection Association,Vol. 1, p.132 - 135, 1992/00
no abstracts in English
-ray plane sources; *;
Hoken Butsuri, 22, p.295 - 299, 1987/00
no abstracts in English
; Tachikawa, Enzo; ; *; Yamamoto, Katsumune
Journal of Nuclear Science and Technology, 23(8), p.722 - 730, 1986/00
Times Cited Count：1 Percentile：20.71(Nuclear Science & Technology)no abstracts in English
Machi, Sueo
Hoshasen Kagaku, 12(24), p.18 - 23, 1977/00
no abstracts in English
Maekawa, Yasunari
no journal, ,
Yoshimura, Kimio; Koshikawa, Hiroshi; Yamaki, Tetsuya; Shishitani, Hideyuki*; Yamaguchi, Susumu*; Tanaka, Hirohisa*; Maekawa, Yasunari
no journal, ,
Since anion-conducting electrolyte membrane fuel cells (AEMFCs) such as direct hydrazine fuel cells operated under high temperature and highly basic condition, it is required to develop alkaline durable AEMs. In this work, we synthesized AEM with poly 2-methyl-1-vinylimidazolium grafts by radiation-induced graft coplymerizaiton to protect 2-position of imidazolium ring from alkaline hydroxide ion attack. The AEM with an ion-exchange capacity (IEC) of 1.80 mmol g exhibited ionic conductivity of 123 mS cm at 60
C. The durability of the membrane was evaluated. The excellent long-term alkaline stability of the prepared AEM was confirmed in 1M KOH at 80C. Therefore, the protection of 2-position by methyl group suppresses ring opening degradation reactions, resulting in the improvement of the alkaline durability of imidazolium-type AEMs.
