aminobenzoic acid

The influences produced by amount of oxidizing agent and theacidare different in thesynthesis of PPA, PMA, and POA because of the difference of site of amino group in aminobenzoic acid. The increase of amount of oxidizing agent is not advantage to enhance the visible light absorption of polymers PPA and POA, but is advantage for polymer PMA.

A precipitate was formed by aminobenzoic acid reacted with [(N[H.sub.4]).sub.2][S.sub.2][O.sub.8] in acidic solution.

Three kinds of poly(aminobenzoic acid) were synthesized by oxidizing p-, m-, or o-aminobenzoic acid with an oxidizing agent of peroxodisulfate ammonium in an acidic solution.