New polymer syntheses .4. Synthesis and characterization of new polyamides containing bis-benzthiazolyl sulphone units in the main chain

Bis(2-aminobenzthiazolyl) sulphone (BABS) was used as a new starting material for preparing polyamides. These polyamides were prepared by reacting BABS with adipoyl, sebacoyl, isophthaloyl and terephthaloyl dichlorides, and also with 4,4'-azodibenzoyl chloride or 3,3'-azodibenzoyl chloride, utilizing the solution polycondensation technique at low temperature. In addition, the model compound was synthesized by condensing the BABS with benzoyl chloride. Characterization of the monomer, model compound and the polyamides was accomplished by H-1 NMR, IR and elemental analyses. The polyamides had reduced viscosities of 0.25-0.63 dl/g in DMF or DMSO at 25 degrees C. All the polymers dissolved readily at room temperature in polar aprotic solvents. The thermal stability of the polymers was evaluated by TGA and DSC measurements.