Structure–Properties Relationship of Some Polyimidazopyrrolones Foils

A series of semiladder polyimidazopyrrolones having amide, ester and ether linkages in the main chain have been synthesized using low-temperature polycondensation in dimethylacetamide (DMA). Solutions of prepolymers in the form of proper polyamideamino acid in DMA were cast onto a glass plate, heated in vacuo at 200 °C for 8 h and then at 280 °C for 2 h to cause evaporation of the solvent and thermal cyclization. Free-standing foils were characterized by Fourier-transform infrared spectroscopy and their mechanical, thermomechanical and optical properties were investigated.