POLYISOPHTHALAMIDES WITH PHENYLSLFONYL PENDENT GROUPS

A series of polyisophthalamides containing phenylsulfonyl groups was p repared from seven aromatic diamines and 5-phenylsulfonylisophthalic a cid by the phosphorylation condensation method, and from 5-phenylsulfo nylisophthaloyl chloride by the solution polycondensation method at lo w temperature. When compared to the analogous unmodified polyisophthal amides, 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 streng th of films and water sorption were also investigated.