Polymers containing anthraquinone and quinoxaline units: Polypyrrolones

✍ Scribed by Dutt, Prabir K. ;Marvel, C. S.

• Book ID: 104535507
• Publisher: Wiley (John Wiley & Sons)
• Year: 1970
• Tongue: English
• Weight: 405 KB
• Volume: 8
• Category: Article
• ISSN: 0449-296X
• DOI: 10.1002/pol.1970.150081116

✦ Synopsis

Abstract

Four ladder or partial ladder polypyrrolones containing anthraquinone recurring units have been synthesized by condensing the dianhydride of 1,2,5,6‐bis(α,β‐dicarboxyl‐pyrazino)anthraquinone with four different tetraamines, 1,2,4,5‐tetraaminobenzene tetrahydrochloride, 3,3′,4,4′‐tetraaminodiphenyl, 3,3′,4,4′‐tetraaminodiphenyl ether, and 1,2,5,6‐tetraaminoanthraquinone in dimethylacetamide and tetramethylene sulfone as reaction media. A prepolymer with an open structure was first formed which on further heating gave a closed‐ring structure. These polymers which were highly colored, powdery materials, were insoluble in common organic solvents and slightly soluble only in concentrated H~2~SO~4~. They could, however, be solubilized in alkali by reduction with sodium dithionite. These polymers with an inherent viscosity in the range of 0.2–0.5, showed good thermal stability.