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 poly condensation in dimethylacetamide (DMA). Solutions of prepolymers in the fo rm of proper polyamideamino acid in DMA were cast onto a glass plate, heate d in vacuo at 200 degreesC for 8 h and then at 280 degreesC for 2 h to caus e evaporation of the solvent and thermal cyclization. Free-standing foils w ere characterized by Fourier-transform infrared spectroscopy and their mech anical, thermomechanical and optical properties were investigated.