Synthesis and properties of polymer containing azo-dye chromophores for nonlinear optical applications

摘要

Some thermal stable polyimides and polyimide/silica hybrid materials containing azo-dye have been synthesized.The resulting polyimides had high weight-average molecular weight(M_w)up to 49 300 and 53 900,respectively,and a large glass transition temperature(T_g)of 242 °C,and the decomposition temperature(T_d)of 350 °C.The resulting polyimide/silica hybrid materials had higher glass transition temperature and decomposition temperature than the pure polyimides.The silica content in the hybrid materials varied from 0 to 22.5 wt%.The electro-optic coefficients(gamma_(33))at the wavelength of 832 nm for polymer thin films poled were in the range of 9-23 pm/V and the values remained well(retained >83% for more than 100 h).The heat capacities of some materials were in the range of 0.8433-1.2564 J K~(-1)g~(-1)for the temperature range from 273 to 363 K.No thermal anomaly was found in this temperature range.