A chromophore containing azo group,4-(4′-nitrophenylazo)benzylamine (NPAB) is synthesized with 4-nitroaniline,sodium nitrite and benzylamine via diazo-coupling reaction.Azobenzene polyurethane(ABPU) containing chiral unit is obtained from NPAB,chiral reagent L(-)-tartaric acid and isophorone diisocyanate(IPDI).The chemical structures of NPAB and ABPU are characterized by FT-IR and UV-Vis spectroscopy and 1H NMR.The thermal property is characterized by using the differential scanning calorimeter(...