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Journal Articles

Polymer electrolyte membranes having sulfoalkyl grafts into ETFE film prepared by radiation-induced copolymerization of methyl acrylate and methyl methacrylate

Hanh, T. T.*; Takahashi, Shuichi; Chen, J.; Sawada, Shinichi; Maekawa, Yasunari

Journal of Applied Polymer Science, 114(1), p.231 - 237, 2009/06

https://doi.org/10.1002/app.30458
 Times Cited Count：6 Percentile：21.63(Polymer Science)

Polymer electrolyte membranes (PEMs) containing alkylsulfonic acid grafts can be prepared by radiation-induced graft copolymerization of methyl acrylate (MA) and methyl methacrylate (MMA) into a poly(ethylene-co-tetrafluoroethylene) (ETFE) film followed by sulfonation of the MA units in the copolymer grafts using an equimolar complex of chlorosulfonic acid and 1,4-dioxane (ClSO$$_{3}$$H-Complex). The grafted films with 33-79 % MA units are treated with ClSO$$_{3}$$H-Complex to obtain PEMs with IEC of 0.36-0.81 mmol/g and proton conductivity of 0.04-0.065 S/cm. The PEMs with higher MMA content showed higher durability in water (80 $$^{circ}$$C) and under oxidative conditions (3% H$$_{2}$$O$$_{2}$$) at 60 $$^{circ}$$C. This is because the PMMA grafts in the PEMs have no proton at an $$alpha$$-carbonyl carbon, which is considered to be a trigger of the degradation of grafting polymers.

Journal Articles

Radiation degradation of alginate and some results of biological effect of degraded alginate on plants

Hien, N. Q.*; Hai, L.*; Luan, L. Q.*; Hanh, T. T. V.*; Nagasawa, Naotsugu; Yoshii, Fumio; Makuuchi, Keizo; Kume, Tamikazu

JAERI-Conf 2000-003, p.94 - 100, 2000/03

no abstracts in English

Oral presentation

Polymer electrolyte membranes consisting of alkyl sulfonic acid for fuel cells, synthesized by radiation-induced graft polymerization and subsequent chemical transformation

Maekawa, Yasunari; Takahashi, Shuichi; Hanh, T. T.*; Okonogi, Hiroyuki*; Hagiwara, Tokio*

no journal, , 

Polymer electrolyte membranes (PEMs) consisting of alkylsulfonic acid in grafting chains can be prepared by radiation-induced graft polymerization of methyl acrylate (MA) onto a poly(ethylene-co-tetrafluoroethylene) (ETFE) film, followed by the sulfonation of MA units in the grafting chains using an equimolar complex of chlorosulfonic acid and dioxane. The sulfonation reaction accompanied equimolar decarboxylation of the MA unit (substitution of carboxylic acid with sulfonic acid) to give the PEMs with conductivity of 0.01-0.11 S/cm. Furthermore, the replacement of the MA unit with methyl metacrylate (MMA) as a comonomer in grafting chains enhances the stability of the PEM at higher temperatures.

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