Preparation of Polyamides Containing α-Diketone Linkage and Their Quinoxaline Derivatives

Abstract

Polyamides containing a-diketone linkage in their main chains were prepared in terms of the method of low-temperature solution polycondensation of 4, 4'-bis (chloroformyl) benzil with aro- matic diamines in N-methylpyrrolidone (NMP)-LiCl solution. The resulting polyamides were allowed to react with o-phenylenediamine to give polyamides containing quinoxaline ring in their side chains. Thermal properties of these polyamides were characterized by means of DTA, DSC, and TGA. It was found that polyamides of m-phenylenediamine and 4, 4'-diaminodiphenyl ether containing quinoxaline ring were thermally more stable than the corresponding parent polyamides containing α-diketone linkage.