分子偶极聚合物驻极体的红外和可见光谱研究

Study of the IR and UV Spectra on Molecular Dipole Polymer Electret

本文利用红外和可见吸收光谱研究了具有二阶非线性光学活性的分子偶极聚合物驻极体材料中偶极子的取向稳定性与分子结构之间的关系 ,讨论了制备时所用的溶剂对材料微结构的影响。结果表明该材料在玻璃态温度下极化时 ,引起生色团分子偶极矩沿电场方向取向 ,是建立在生色团分子共轭π体系被破坏的基础上 ,这是一种亚稳态。偶氮类分子的顺 反结构在光、热的作用下极易发生转变 ,是引起常温下生色团分子有序取向结构松弛的主要原因。制备时所用的溶剂将影响生色团分子在聚合物基底中的存在形式 。

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 affect 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.