Abstract
AbstractA new class of polysulfonamideimide has been synthesized by the two‐step cyclopolycondensation of 4‐chlorosulfonylphthalic anhydride with aliphatic and aromatic diamines. The polycondensation‐addition reaction proceeded through the formation of poly(sulfonamideamide acids), and a subsequent thermal or chemical cyclodehydration of the precursor polymers yielded polysulfonamideimides. The poly(sulfonamide amide acids) having inherent viscosity in the range of 0.1–0.7 in dimethylacetamide were obtained in high yield. All of the polymers were soluble in polar aprotic solvents and in basic solvents. Aromatic polysulfonamideimide derived from bis(4‐aminophenyl) ether began to decompose at around 350°C in air as determined by differential thermal analysis and thermogravimetric analysis.
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