SYNTHESIS AND CHARACTERIZATION OF RANDOM POLY(AMIDE-SULFONAMIDE)S .3.COPOLYMERS FROM 2 DIAMINO MONOMERS

Four new series of poly(amide-sulfonamide)s (PASAs), having different ratios of two different diamino monomer moieties in the polymer backbo ne, were obtained by low-temperature solution polycondensation of the respective diamines with terephthaloyl chloridelisophthaloyl chloride. With the exception of the most highly symmetric polymer series, all o f the other polymers were readily soluble in aprotic polar solvents su ch as N,N-dimethylacetamide, dimethylformamide and dimethyl sulfoxide. The three series of soluble polymers had intrinsic viscosities in the ranges 0.51-0.72, 0.33-0.49 and 0.70-0.92 dl g(-1). Differential scan ning calorimetry showed these PASAs to have glass transition temperatu res greater than 250 degrees C. Thermogravimetric analysis of the poly mers showed moderate thermal stabilities, with 10% weight losses being recorded over the range 382-408 degrees C. X-ray diffraction studies indicated that some of these polymers possess a certain degree of crys tallinity.