Polyphenylquinoxaline (PPQ) was usually synthesized from tetraamine and te-traketone. We found that the oxidizing agent--selenium oxide (SeO2) commonlyused in the synthesis of tetraketone was not satisfactory. In this work we replaced selenium oxide by dimethyl sulfoxide (DMSO)

resulting in a simplified procedure

lower cost and high purity. In order to facilitate the coating process

stable solutions of relatively high molecular weight PPQ were prepared by changing the stoichio-metry with 1-2% excess of tetraketone. All properties of these polymers were de-termined on their films and varnished wires.It was shown that the PPQ can be used as a good water resistant

chemical resistant and/or oil resistant materials.