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Chen, J.; Septiani, U.*; Asano, Masaharu; Maekawa, Yasunari; Kubota, Hitoshi*; Yoshida, Masaru
Journal of Applied Polymer Science, 103(3), p.1966 - 1972, 2007/03
Times Cited Count：20 Percentile：52.89(Polymer Science)In this study, ETFE and PVDF films, together with the crosslinked PTFE (cPTFE) films have been compared on the basis of their preparation and properties of radiation-grafted polymer electrolyte membranes (PEM). The proton conductivity and chemical stability of the three types of membranes with the similar ion exchange capacity near 1.0 mmolg
were investigated and discussed in detail. Although the ETFE-based PEM was relatively more stable, its proton conductivity was lower than those of the PVDF- and cPTFE-based membranes. On the other hand, the cPTFE-based membrane showed the significantly higher proton conductivity, but its chemical stability was shorter than that of the ETFE-based membrane. The difference in the preparation and properties of the PEMs was due to the difference in the crystallinity and intrinsic properties of the base films.
Septiani, U.*; Chen, J.; Asano, Masaharu; Maekawa, Yasunari; Yoshida, Masaru; Kubota, Hitoshi*
Journal of Materials Science, 42(4), p.1330 - 1335, 2007/02
Times Cited Count：16 Percentile：47.64(Materials Science, Multidisciplinary)The influence of pre-irradiation atmosphere, argon and air, on radiation grafting of styrene into poly(ethylene-co-tetrafluoroethylene) (ETFE) films and the properties of the ETFE-based radiation-grafted polymer electrolyte membranes were investigated. The preparation and properties of the membranes were found to be strongly influenced by the 
-ray pre-irradiation atmosphere. The proton conductivity was measured in its water-saturated state at 25
C, and the membrane durability was tested in a 3 % H
O aqueous solution at 60C. The proton conductivity of the membrane prepared by pre-irradiation under air was higher than that of the membrane prepared under argon with the same ion exchange capacity level. However, the durability of the former was considerably lower than that of the latter. For instance, the membrane with an ion exchange capacity of about 1.0 mmolg-1 prepared under argon was twice as durable as that prepared under air. It was considered that the lower durability of the membrane prepared by pre-irradiation under air was because of the unstable ether bond introduced between the graft chains and the backbone chains. : polymer electrolyte membrane (PEM); radiation grafting; styrene; durability; ETFE
Septiani, U.; Chen, J.; Asano, Masaharu; Maekawa, Yasunari; Kubota, Hitoshi*; Yoshida, Masaru
no journal, ,
Both the effect of pre-irradiation atmosphere, argon and air, on the radiation grafting of styrene into poly(ethylene-co-tetrafluoroethylene) (ETFE) films and the durability of the relevant ETFE-based polymer electrolyte membranes (PEM) were investigated. It was found that the ETFE-based PEM prepared under air showed a very low durability compared with that under argon. This is due to the introduced unstable ether bond between the grafted chain and backbone film.
