Polyamides containing s-triazine rings and fluorene “cardo”groups: synthesis and characterization

Two new polyamides containing s-triazine rings and fluorene “cardo” groups were synthesized by low temperature interfacial polycondensation of two s-triazine ring containing diacyl chlorides viz. 2,4-bis(4-chlorocarbonylphenoxy)-6-methoxy-s-triazine and 2,4-bis(3-chlorocarbonylphenoxy)-6-methoxy-s-triazine with a cardo diamine viz. 9,9-bis(4-aminophenyl) fluorene. The resulting polyamides were characterized by elemental analysis, viscosity measurements, X-ray diffraction studies, thermogravimetry and IR, 1H- and 13C-NMR spectroscopy. The polyamides PA-1 and PA-2 had inherent viscosity values 0.52 and 0.60 dl/g respectively in N,N-dimethylacetamide (DMAc) at 30°C. Both the polyamides were found to be readily soluble at room temperature in polar solvents such as dimethylsulfoxide, DMAc, N,N-dimethylformamide, N-methyl-2-pyrrolidone and m-cresol. Transparent, tough and flexible films of polyamides could be cast from DMAc solution. Thermogravimetric analysis of the polyamides indicated no weight loss below 360°C under nitrogen atmosphere.