[Study of the IR and UV spectra on molecular dipole polymer electret]

The relation between the orientational stability and molecule structure in the molecule dipole polymer electret with second-order optical nonlinearities was studied by means of IR and UV spectra. The effect of the solvents on the structure was discussed when the materials were prepared. The results showed that dipole moment orientation would damaged the conjugate pi system of the chromophore dipole molecule when the specimen was poled around the glass transition temperature. The Cis-Trans photoisomerization and thermal isomerization of azobenzene group was main reason that caused the dipole orientational relaxation. The used solvents when the specimen were prepared will affect material structure and consequently affect the nonlinear optics stability of molecular dipole polymer electrets.