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The Preparation Of Conducting Polyaniline–silver And Poly(p-phenylenediamine)–silver Nanocomposites In Liquid And Frozen Reaction Mixtures

P. Bober, J. Stejskal, M. Trchová, J. Prokes
Published 2011 · Chemistry

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The oxidation of aniline with silver nitrate in 1 mol L−1 acetic acid at 20 °C yielded a composite of two conducting components, polyaniline and silver; the acceleration with 1 mol% of p-phenylenediamine is needed for efficient synthesis. The yield and molecular weight increased when aniline was copolymerized with 10 mol% p-phenylenediamine. Such product displayed metallic conductivity below 180 K and semiconductor type above this temperature. As the result, the conductivity was the same at 100 and 300 K. The oxidation of p-phenylenediamine alone with silver nitrate also produced a conducting composite having the conductivity of 1,750 S cm−1 despite the assumed nonconductivity of poly(p-phenylenediamine). The present study demonstrates that all oxidations proceeded also in frozen reaction mixtures at −24 °C, i.e., in the solid state. In most cases, molecular weights of polymer component increased, the conductivity of composites with silver improved, to 2,990 S cm−1 for poly(p-phenylenediamine)–silver, and remained high after deprotonation with 1 mol L−1 ammonium hydroxide.
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