SYNTHESIS AND THERMAL-PROPERTIES OF AROMATIC POLYMERS CONTAINING 3,6-QUINOLINE UNITS IN THE MAIN CHAIN

The condensation of 4, 4'-diamino-3, 3'-dibenzoyldiphenyl ether and 4, 4'-diamino-3, 3'-dibenzoylbiphenyl with a series of bis(phenacyl) monomers in m-cresol-di-m-cresyl phosphate afforded high molecular weight polyquinolines with varying degrees of flexibility in the polymer main chain. The more flexible polymers exhibited good solubilities in chloroform or sym-tetrachloroethane and had glass transition temperatures (Tg) ranging from 255 to 325 °C. The less flexible polymers were soluble in acidic solvents such as m-cresol or sulfuric acid and exhibited Tg s ranging from 305-390 °C and crystalline transition temperatures ranging from 475-530 °C. Although initially the polymers were X-ray amorphous (<20%), approximately 30-50% crystallinity could be induced either by precipitation from solution or by annealing above the Tg. © 1979, American Chemical Society. All rights reserved.