2014 年 39 巻 1 号 p. 27-30
Anion exchange membranes for alkaline fuel cells based on phenolphthalein derivatives were prepared. First, phenolphthalein was derivatized with N,N,-dimethyl-1,3-propanediamine (DMPDA) and N,N,-dimethyl-1,2-ethanediamine (DMEDA). Copolymers containing DMPDA and DMEDA were then prepared via step-condensation or polycondensation polymerization using 4,4'-dichlorodiphenylsulfone or 2,6-dichlorobenzonitrile as an activated dihalide. These copolymers were first solution cast and then reacted with methyl iodide to generate quaternary ammonium groups. The new anion exchange membranes showed high anion conductivity of>10 mS/cm at 30 °C. Thorough investigation of the chemical stability of the copolymers under basic conditions indicated that DMPDA-containing copolymers showed higher stability than DMEDA-containing copolymers. The relationship between the chemical structure and stability was systematically studied.
