Novel imide-modified polyurethanes, synthesis and thermal characteristics

New (polyurethane-imide)s (PUIs) were synthesized by polyaddition reaction of two different diisocyanates with three different imide containing diols. The reactions were performed in DMAc solvent at 100 degreesC using dibutyltin dilaurate as a catalyst. The structure of diols and PUIs were characterized by conventional methods including H-1 NMR, FTIR, and mass spectroscopies, and physical properties such as solution viscosity, solubility property, thermal stability and thermal behaviour were studied for PUIs. These polymers showed excellent solubility in polar aprotic and chlorinated solvents. Their inherent viscosities were in the range of 0.28-0.35 dL/g. Also their 10% weight loss were in the temperature range of 323-358 degreesC.