Synthesis and characterization of new polyamides and copolyamides containing 6,6 '-sulfonediquinoline units

Aromatic polyamides were obtained by the direct polycondensation reaction o f a new monomer containing a 6,6'-sulfonediquinoline unit with various arom atic diamines. The polymers were characterised by elemental, infrared, wide angle X-ray diffraction and thermal analysis. The polyamides, possessed in herent viscosities in the range 0.24 - 0.43 dl g(-1), 10% weight loss in ni trogen and air above 410 degrees C and glass transition temperatures in the range 170-220 degrees C. The polyamides obtained by reaction with 4,4'-met hylenedianiline and 4,4'-sulfonyldianiline were soluble on heating in N-met hyl-2-pyrrolidinone and partially soluble in dimethylacetamide. Solubility and thermal properties of copolyamides, prepared from the reaction of 4,4'- oxydianiline with the new monomer and the 4,4'-dicarboxydiphenyl sulfone, w ere also studied.