An investigation into the synthesis of polycarbazole squaraine derivatives

Summary

The polycondensation of squaric acid with l,2-(9-Etbylcarbazol-3-yl)etheiie and N-ethyliminostilbene in polyphosphoric acid yielded insoluble polymers which included substituted phosphate groups on the phenyl rings. The presence of phosphorus in these polymers was identified using solid-state ³¹P NMR and EDAX techniques. Furthermore the phosphate groups were not ionic, hence no charge-balancing anions were present. Both polymers did not electrically conduct but exhibited dielectric breakdown values of 0.1 and 0.06 MVcm⁻¹ respectively.