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Oral presentation

Characterization of ion-exchange membranes prepared by ion irradiation graft polymerization method and $$gamma$$-ray irradiation graft polymerization method

Goto, Mitsuaki*; Omori, Masayuki*; Yamaki, Tetsuya; Sawada, Shinichi; Koshikawa, Hiroshi; Kitamura, Akane; Higa, Mitsuru*

no journal, , 

We have prepared cation exchange membranes for applications to electrochemical energy-conversion devices by swift-heavy-ion irradiation, and then investigated their charge density, ${it i.e.}$, a concentration of fixed charge groups, in comparison with that of the conventional $$gamma$$-ray-grafted membranes. Poly(ethylene-${it co}$-tetrafluoroethylene) films with a 25 $$mu$$m thickness were irradiated in a vacuum chamber with 560 MeV $$^{129}$$Xe and subsequently immersed in a grafting solution containing sodium ${it p}$-styrenesulfonate at 60$$^{circ}$$C. The charge density was estimated through the measurement of the membrane potential in an aqueous solution of potassium chloride. Our membranes exhibited higher charge density (reaching 2.40 mol/dm$$^{3}$$ at maximum) than the $$gamma$$-ray-grafted samples probably due to track structures characteristic of the bombarding heavy ions.

Oral presentation

Characterization of ion-exchange membranes prepared by ion irradiation graft polymerization method

Goto, Mitsuaki*; Yamaki, Tetsuya; Koshikawa, Hiroshi; Sawada, Shinichi; Kitamura, Akane; Higa, Mitsuru*

no journal, , 

We have exploited a grafting technique with heavy-ion beams to create ion exchange membranes for various practical applications such as fuel cells and water desalination systems. In this study, instead of styrene that is a common monomer, sodium styrene sulfonate (SSS) was for the first time employed for this so-called ion-track grafting. A 25 $$mu$$m-thick poly(vinylidene fluoride) film was bombarded with 560 MeV $$^{129}$$Xe at a fluence of 3.0$$times$$10$$^{8}$$ or 1.0$$times$$10$$^{9}$$ ions/cm$$^{2}$$, and subsequently immersed in a SSS grafting solution at 60$$^{circ}$$C. The charge density was estimated through the measurement of the membrane potential in an aqueous solution of potassium chloride. Our membranes exhibited higher charge density than the conventional or commercially-available samples probably due to track structures characteristic of the bombarding heavy ions.

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