Treatment of poly(2-methoxyaniline-5-sulfonic acid) ( PAS ) with LiOH gave its lithium salts, PAS(Li) s, with various degrees of lithium sulfonation. Structure of a fully lithium-sulfonated PAS(Li) was determined by 1 H NMR spectroscopy and elemental analysis. Cyclic voltammetry and complex impedance analysis revealed electrochemical properties of the PAS(Li) films depending on the degree of the lithium sulfonation. PAS(Li) s had ionic conductivity of about 1 × 10 -6 S cm -1 at 302 K. The packing structure of PAS(Li) is discussed on the basis of powder XRD data.
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Yamamoto et al. (2003) studied this question.
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