Synthesis and characterization of new polyamides containing 6,6′-methylenediquinoline units

Aromatic polyamides have been synthesised from a new monomer containing a 6,6′-methylenediquinoline unit by reaction with various diamines by the phosphorylation route. The polymers have been characterised by elemental analysis, infrared, thermogravimetric analysis and differential scanning calorimetry. The polyamides, obtained in quantitative yield, possessed inherent viscosities in the range 0.20-0.85 dl g-1, 10% weight loss in nitrogen and air above 420°C and glass transition temperatures in the range 184-294°C. The polyamides obtained by reaction of this new monomer with 4,4′-oxydianiline and 4,4′-methylenedianiline were soluble on heating in N-methyl-2-pyrrolidone and partially soluble in dimethylacetamide. The properties of these polymers are compared with those of corresponding polyamides having only one quinoline ring per repeat unit.