An FTIR method was used to investigate the thermal cyclization process in synthesis of polyetherimidazopyrrolones from dietherdianhydrides and 3,3 0 -diaminobenzidine. It was concluded that the highest degree of cyclization to imidazopyrrolone structure is observed in the case of polymer with bisphenol A group having electron-donating character after dynamic heating, though for the all polyether-imides investigated even at 3208C cyclization are not complete.
Посилання на статтю:
FTIR study of thermal cyclization processes in the synthesis of polyetherimidazopyrrolones / D. Sek, B. Kaczmarczyk, E. Schab-Balcerzak // Polymer. – 1999. – N 40. – P. 7303–7312.