Abstract
A new monomer containing preformed parabanic ring, 1,3-( p-chloroformylphenyl) parabanic acid (II), can be obtained easy by the reaction between p-aminobenzoic acid and phosgene in aqueous solution. The urea acid intermediate was reacted with oxalyl chloride to obtain II. Aromtic polyamides with parabanic structure were synthesized from II and aromatic diamines in dimethylacetamide. From polymer solutions flexible films can be obtained with good electrical insulating properties and good thermal stabilities.
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