Preparation of Soluble Polypyrrole Composites and Their Uptake Properties for Anionic Compounds

Abstract

Soluble composite particles consisting of polypyrrole−poly(vinylpyrrolidone) and polypyrrole−poly(vinyl alcohol) were prepared, and their stabilities and ion exchange properties were compared with those for polyaniline−poly(vinyl alcohol) composites. The dispersions of the polypyrrole-based composites were more stable in solution than those for the polyaniline-based ones but extracted organic molecules less rapidly and quantitatively. However, EPR investigation indicated that the polypyrrole composites had substantially greater numbers of cationic sites than the polyaniline composites at pH greater than 6. Enantioseparation of amino acids was attempted by using a polypyrrole−poly(vinyl alcohol) composite doped with N-carbobenzoxy-l-aspartic acid as a chiral selector.