Abstract
A new type of polyamide containing ester and carboxyl groups, which are soluble in organic solvents, has been produced by low temperature polycondensation of aromatic diaminodicarboxylic acids having NH 2 and COOH groups in ortho-position to each other (5,5-methylenedianthranylic and 3,3-benzidinedicarboxylic acids) with 2,5-di (carbomethoxy) terephthaloyl chloride. The effect of the polycondensation conditions on the reduced viscosity (the mol.wt.) of the polyamides has been investigated. Imidization of the polyamides, followed by ammonolysis of the polyimides and thermal cyclization of the polymeric ammonolyzate, yielded new heat resistant, heterocyclic, ladder-like polymers, i.e. the poly-isoindoloquinazolinediones. These polymers are not soluble in organic solvents and only dissolved with difficulty in concentrated sulphuric acid. According to the thermodynamic TGA in air, the start temperature of decomposition of the poly-isoindoloquinazolinediones is in the range 400–420°C. This range coincides also with the softening temperature.
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