Abstract
A new chromophore containing azo group, 3,3'-dichloro-4,4'–di-(4-amino-azo-phenyl) -diphenylmethane (CAAPM), was synthesized based on 3,3'-dichloro-4,4'-diamino– diphenylmethane, sodium nitrite and benzenamine via diazo-coupling reaction. Azobenzene polyurethane (PU) containing chiral unit was obtained from CAAPM, chiral reagent L(-)-tartaric acid and isophorone diisocyanate (IPDI). The chemical structures of CAAPM and PU were characterized by FT-IR and UV-Vis spectroscopy. The measurements of refractive index (n) and thermo-optic coefficient (dn/dT) of polyurethane were demonstrated at complex light. The values of n and dn/dT were used to calculate the dielectric constant (ε) and its variation with temperature (dε/dT). The dn/dT is 4.2000～-3.7000×10-4°C-1. The conclusion has a little significance to develop new the digital optical switch (DOS).
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