二阶非线性光学活性聚酰亚胺有机-无机杂化材料的合成与表征

Synthesis and Characterization of a Second-order Nonlinear Optical Organic/Inorganic Polyimide Hybrid Material

通过溶胶 -凝胶法制备了含二阶非线性光学发色团分散红 1 9(DR1 9)的硅氧烷染料与聚酰亚胺有机 -无机杂化材料 .利用红外光谱、紫外 -可见光谱、 SEM、 DSC和 TGA等手段对其进行了表征 .杂化极化后的序参数高达 0 .48,并具有优良的极化取向稳定性 ,42 3 K下处理 3 0 0 h后 ,序参数仍能保持初始值的 90 % .杂化薄膜有较好的表面平整性 ,其断面呈网络结构 .杂化材料的玻璃化转变温度 (Tg)为 5 61 K,比纯聚酰亚胺的 Tg(5 43 K)高 1 8K,表现出优良的高温热稳定性 ,其 5 %热失重温度为 691 K,1 0 %热失重温度为 75 8K.

A second order nonlinear optical(NLO) organic/inorganic hybrid polyimide was successfully prepared by sol gel process, and was characterized by FTIR spectroscopy, UV Vis spectroscopy, SEM, DSC and TGA. The order parameter of the hybrid material after the polarization is 0 48 and it maintains 90% of the initial value after the treatment for 300 h at 150 ℃. The SEM analysis shows that the surface of the hybrid thin film is very smooth, and cross linking structure is observed in the cross section. The T g of the polyimide/inorganic hybrid material(561 K) is higher than that of the corresponding pure polyimide(543 K). The sol gel hybrid thin film also exhibits a good thermal stability, with 5% and 10% weight loss temperatures at 691 and 758 K, respectively.