Abstract
AbstractAn imide‐ring‐containing dicarboxylic acid, N,N′‐(9‐fluorenylidenedi‐1,4‐phenylene)diphthal‐imide‐4‐carboxylic acid (1), was prepared by condensation of trimellitic anhydride and 9,9‐bis(4‐aminophenyl)fluorene. A series of new aromatic cardo poly(amide‐imide)s having inherent viscosities of 0,59‐1,13 dL/g were prepared by the direct polycondensation of this diimide‐diacid with various aromatic diamines using triphenyl phosphite and pyridine as condensing agents in 1‐methyl‐2‐pyrrolidone (NMP) in the presence of calcium chloride. The polymers are amorphous and readily soluble in highly polar solvents such as N,N‐dimethylformamide, N,N‐dimethylacetamide, dimethyl sulfoxide, NMP, and m‐cresol. Transparent and tough films can be easily cast from the polymer solutions. The glass transition temperatures of these poly(amide‐imide)s are above 320°C. Thermal analyses indicated that these polymers are fairly stable, and the 10% weight loss temperatures were recorded in the range of 532–622°C in nitrogen atmosphere.
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