极化条件对偶氮化合物薄膜中分子取向的影响

 为探索不同的极化条件对分子取向的影响，用旋涂法制备了偶氮主客体掺杂薄膜，并用电晕极化的方法分别在不同温度和厚度条件下使分子取向，通过测量极化前后紫外-可见吸收谱，研究了平均取向因子的变化，并和二次谐波产生结果进行了比较。实验结果表明：对于厚度相同的偶氮薄膜，随着温度的升高，平均取向因子增大，但二次谐波信号强度先增大后减小；温度越接近聚合物玻璃转变温度，分子越容易取向，但温度过高，聚甲基丙烯酸甲酯变为粘滞态，部分偶氮分子容易在高温下蒸发掉，导致二次谐波信号强度降低，而平均取向因子增大；随着薄膜厚度的增大，针-板电极电场造成薄膜内部电场分布的不均匀性增加，极化效率降低，平均取向因子不断减小,二次谐波信号强度先增大后减小。

Effects of polarization conditions on molecular orientation in azo-dye compound film

In order to investigate the influence of polarization conditions on azo-dye molecular orientation in films,azo-dye polymer films of guest-host system were prepared by spin-coating method.The average alignment factor of azo-dye molecules in films were investigated by UV-Vis spectra measured before and after corona poling,as well as second harmonic generation at different corona poling conditions.The experimental results show that the average alignment factor of azo-dye films becomes bigger,and second harmoni...