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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.
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.