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

LiCl溶液中の熱応答性ポリ(アクリロイル-L-プロリンメチルエステル)ゲル膜のインピーダンス分析

Chen, J.; 浅野 雅春; 坪川 紀夫*; 前川 康成; 八巻 徹也; 吉田 勝

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

$$gamma$$線キャスト重合により、熱応答性ポリ(アクリロイル-L-プロリンメチルエステル)ゲル膜を合成した。LiCl溶液を満たした電極付きH型ガラスセルを用いたインピーダンス装置により、ゲル膜のイオン導電性を測定するための新しい手法を提案した。さらに、温度を変化させたインピーダンス分析の結果から、ゲル膜のイオン導電性は14$$^{circ}$$Cで最も高いイオン導電率(約0.2S/cm)を示すことがわかった。このイオン導電性の温度依存性はポリ(アクリロイル-L-プロリンメチルエステル)ゲルの相転移に基づく複雑な非線形に起因していると、推察した。

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.

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パーセンタイル:100

分野:Polymer Science

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