Polyisophthalamides with phenylsulfonyl pendent groups

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Abstract
A series of polyisophthalamides containing phenylsulfonyl groups was prepared from seven aromatic diamines and 5‐phenylsulfonylisophthalic acid by the phosphorylation condensation method, and from 5‐phenylsulfonylisophthaloyl chloride by the solution polycondensation method at low temperature. When compared to the analogous unmodified polyisophthalamides, the modified ones were found to be essentially amorphous, and they showed better solubility in organic solvents, and slightly higher glass transition temperatures. Thermogravimetric analysis showed that the polyisophthalamides containing pendent phenylsulfonyl groups have thermal stabilities similar to the unmodified ones. Mechanical strength of films and water sorption were also investigated. © 1993 John Wiley & Sons, Inc.

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