Preparation and Optical Properties of Azo Polymer Containing Benzothiazole Group
A novel chromophore molecule (HEPNBT) was synthesized by diazo-coupling reaction. The polyurethane (HEPU) was obtained from chromophore molecule HEPNBT, NJ-220 and isophorone diisocyanate (IPDI). The structures of HEPNBT and HEPU were characterized using the Fourier transform infrared and UV-visible spectroscopy. The refractive index (n) of HEPU was determined at different temperature and wavelength (532nm, 650nm and 850nm) using attenuated total reflection (ATR) technique, and the thermo-optic coefficient (dn/dT) was -4.149×10-4 °C-1(532nm), -7.954×10-4°C-1 (650nm) and -6.71Superscript text4×10-4°C-1 (850nm), resSuperscript textpectively. Using the CCD digital imaging devices, transmission loss of HEPU was measured and the value was 0.238 dB/cm. The results show that the obtained HEPU has a certain significance to the development of new types of digital thermo-optic switch material.
Yuan Ming Huang
G. Y. Wu et al., "Preparation and Optical Properties of Azo Polymer Containing Benzothiazole Group", Key Engineering Materials, Vol. 538, pp. 11-14, 2013