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 backbone, 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 of the other polymers were readily soluble in aprotic polar solvents such 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 scanning calorimetry showed these PASAs to have glass transition temperatures greater than 250 degrees C. Thermogravimetric analysis of the polymers 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 crystallinity.