New chiral poly(urethane-imide)s. Synthesis, characterization and optical properties

New poly(urethane-imide)s have been prepared by the classical polyaddition reaction of two imide-containing diols with hexamethylene diisocyanate. The chirality was provided by the diols whose design was performed in two synthesis steps. The structure of the polymers were confirmed by elemental analysis and IR, 1H NMR spectroscopy techniques. The polymers have been also characterized by WAXD, DSC, TGA and solubility measurements. The specific rotatory power [a]546 was measured and the mean residue rotations [m]546 values were calculated. The refractive index of each polymer was determined by succesive dilution measurements. The transparency (T) and stress optical coefficient (SOC) were also determined.