Co-poly(urethane-imide)s based on poly[di(ethylene glycol) adipate] and their compositions with thermoplastic polyimide: synthesis and properties

Based on poly[di(ethylene glycol) adipate] (Mn = 2500) terminated by 2,4-toluene diiso-cyanate (TDI), bis(3´,4-dicarboxyphenoxy)benzene (dianhydride R), and 1,4-bis(4´-amino-phenoxy)biphenyl (diamine ODFO) a number of co-poly(urethane-imide) samples with the general formula (R-TDI-2500-TDI-R)(ODFO)n (n = 1–3, 5), differing in the content of aromatic blocks (from 37 to 65 wt.%) were obtained. The synthesized samples were characterized by the TGA, DSC, and DMA methods and were used to prepare mixed compositions with the known R-ODFO polyimide in two versions, namely, with a polyimide content of 10 and 90 wt.%. Mixed compositions were investigated by DSC. The effect of an increase in the relative content of imide units on the glass transition and melting temperatures of the crystalline phase of copolymers and mixed compositions is detected.