AN INVESTIGATION INTO THE SYNTHESIS OF POLYCARBAZOLE SQUARAINE DERIVATIVES

The polycondensation of squaric acid with 1,2-(9-Ethylcarbazol-3-yl)et hene and N-ethyliminostilbene in polyphosphoric acid yielded insoluble polymers which included substituted phosphate groups on the phenyl ri ngs. The presence of phosphorus in these polymers was identified using solid-state P-31 NMR and EDAX techniques. Furthermore the phosphate g roups were not ionic, hence no charge-balancing anions were present; B oth polymers did not electrically conduct but exhibited dielectric bre akdown values of 0.1 and 0.06 MV cm(-1) respectively.