Abstract
Optically active azobenzene polyurethane (OAAPU) containing donor-Π-acceptor azo group and asymmetric center was obtained from chromophore NABZ, chiral reagent L(-)-tartaric acid and toluene diisocyanate (TDI). The chemical structure and the thermal property were characterized by UV-Vis spectroscopy, FT-IR, 1H NMR and differential scanning calorimeter. The optical switching parameters: refractive indices, thermo-optic coefficients, the dielectric constants and volume expansion coefficients of OAAPU were obtained. The refractive index of OAAPU polymer decreased linearity with the increasing of temperature at the same OAAPU content and had a high thermo-optic coefficient −4.0714–−3.8686×10−4°C−1. The conclusion has a little significance to develop new digital optical switch material.
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