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Journal Articles

Impedance spectra analysis of thermoresponsive poly(acryloyl-$$_{L}$$-proline methyl ester) gel membrane in LiCl solution

Chen, J.; Asano, Masaharu; Tsubokawa, Norio*; Maekawa, Yasunari; Yamaki, Tetsuya; Yoshida, Masaru

Journal of Polymer Science, Part B; Polymer Physics, 43(20), p.2843 - 2851, 2005/10

 Times Cited Count:0 Percentile:100(Polymer Science)

Impedance spectra analysis of a thermo-responsive poly(acryloyl-$$_{L}$$-proline methyl ester) (poly(A-ProOMe)) hydrogel membranes in an aqueous solution of LiCl was carried out using a simple equivalent model. The hydrogel membrane was synthesized by $$gamma$$-radiation-induced polymerization and crosslinking of A-ProOMe monomer aqueous solution in a glass-cast. By means of the impedance spectra analysis, a novel method for the calculation of the ionic conductivity of the hydrogel membranes in LiCl solution was proposed. The calculated ionic conductivity was in agreement well with the determined value. In addition, effects of temperature and LiCl concentration on the impedance spectra and ionic conductivity of the gel membrane were analysized. Results indicated that the impedance spectra analysis is a very useful tool for evaluating the electric properties of gel membranes in an electrolyte solution. The poly(A-ProOMe) gel membrane in 1.0 M LiCl solution showed a high ionic conductivity of about 0.2 S/cm at 14$$^{circ}$$C. The temperature-dependence of the ionic conductivity was a complex nonlinear form due to the volume phase transition of the thermo-responsive poly(A-ProOMe) gel membrane, and the volume phase transition temperature appeared to be decreased with the increase in the LiCl concentration.

Journal Articles

Radiation grafting of styrene into crosslinked PTEE films and subsequent sulfonation for fuel cell applications

Yamaki, Tetsuya; Asano, Masaharu; Maekawa, Yasunari; Morita, Yosuke; Suwa, Takeshi; Chen, J.*; Tsubokawa, Norio*; Kobayashi, Kazuhiro*; Kubota, Hitoshi*; Yoshida, Masaru

Radiation Physics and Chemistry, 67(3-4), p.403 - 407, 2003/08

 Times Cited Count:72 Percentile:2.54

no abstracts in English

Journal Articles

Vapor response properties of conducting composites prepared from crystalline oligomer-grafted carbon black

Chen, J.*; Tsubokawa, Norio*; Maekawa, Yasunari; Yoshida, Masaru

Carbon, 40(9), p.1597 - 1617, 2002/08

 Times Cited Count:20 Percentile:25.86

no abstracts in English

Journal Articles

Impedance effect on ion transport in a temperature-sensitive gel membrane

Chen, J.; Hasegawa, Shin; Ohashi, Hitoshi; Maekawa, Yasunari; Yoshida, Masaru; Katakai, Ryoichi; Tsubokawa, Norio*

Macromolecular Rapid Communications, 23(2), p.141 - 144, 2002/01

 Times Cited Count:8 Percentile:67.42

no abstracts in English

Journal Articles

Thermoresponsive conductivity of poly(${it N}$-isopropylacrylamide)/potassium chloride gel electrolytes

Chen, J.; Maekawa, Yasunari; Yoshida, Masaru; Tsubokawa, Norio*

Journal of Polymer Science, Part B; Polymer Physics, 40, p.134 - 141, 2001/11

no abstracts in English

Journal Articles

Temperature-switchable vapor sensor materials based on ${it N}$-isopropylacrylamide and calcium chloride

Chen, J.; Yoshida, Masaru; Maekawa, Yasunari; Tsubokawa, Norio*

Polymer, 42(23), p.9361 - 9365, 2001/11

 Times Cited Count:30 Percentile:26.11

no abstracts in English

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