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前川 康成
no journal, ,
Radiation-induced grafting technique was applied to the development of proton- and anion-exchange membranes (PEM and AEM) for hydrogen- and alkaline hydrated hydrazine-fuel cells (FCs). For PEM, mechanically and thermally stable poly(ether ether ketone) (PEEK) film could be converted to graft-type PEMs (PEEK-PEMs), which showed superior conductivity and tensile strength under low and high RH conditions than those of Nafion, Accordingly, the PEEK-PEMs with high IEC values possesses both superior conductive and mechanical properties. In contrast, by introducing poly(vinylimidazolium hydroxide) (PVIm) as an anion exchange group using radiation grafting, poly(ethylene-co-tetrafluoroethylene) (ETFE) could be converted to ETFE-AEMs, exhibiting higher anion conductivity and alkaline stability than commercial AEMs. We proved that moderate basicity and dissociation properties of PVIm were important characteristic for conductivity and alkaline stability.
前川 康成
no journal, ,
Radiation-induced grafting technique was applied to the development of polymer electrolyte membranes (PEMs) for hydrogen-fuel cells. Mechanically and thermally stable poly(ethylene-co-tetrafluoroethylene) (ETFE) films could be converted to graft-type PEMs (ETFE-PEMs). Compared with Nafion, the PEMs showed superior conductivity and tensile strength under low (30%) and high (100%) relative humidity conditions, respectively. Using SAXS and USAXS, the ETFE-PEMs with IECs 
2.7 mmol/g were characterized as being composed of graft polymer domains around lamellar crystals with a period of 20-30 nm and well-connected crystallite network domains with a d-range of 200-300 nm. From the above analysis, it is revealed that well interconnected ion-channels around the crystallites and the remaining lamellar crystals and crystallites in the graft-type PEMs were the origins of higher conductivity and tensile strengths, respectively, compared with conventional PEMs.