以3, 5-二硝基苯甲酰氯、雌二醇及溴代正辛烷为原料合成了含有稠环结构的新型功能性二胺(H8-c)。用1, 2, 3, 4-环丁烷四甲酸二酐 (CBDA)、对苯二胺 (PDA) 及H8-c共聚制备了一种聚酰亚胺 (PI) 液晶垂直取向剂。该PI膜作为取向层制得的液晶盒，在120 ℃下烘烤12 h仍可垂直取向，拥有良好的垂直取向热稳定性。热重分析 (TGA) 测试表明其具有良好的热稳定性，在氮气中，这种PI 的5%热失重温度 (T5) 和10%热失重温度(T10)分别高达400 ℃和480 ℃。紫外可见光谱 (UV-vis) 显示此PI膜在400 nm以上具有高的透过率，可达95%以上。

A novel functional diamine (H8-c) with thick ring and long alkoxy was synthesized from 3,5-dinitrobenzoyl chloride, estradiol and 1-Bromooctane. A polyimide (PI), applied in liquid crystal (LC) vertical orientation agent, was prepared from p-phenylenediamine (PDA), 1,2,3,4-cyclobutanetetracarboxylicdianhydride (CBDA) and H8-c. The PI possessed excellent vertical alignment for nematic LC. The vertical alignment of LC cell which was kept at 120 ℃ for 12 h was still stable. It could be seen that the thermal stability of the vertical alignment of LC was excellent. The temperature at 5% weight loss of the PI (T5) is as high as 400 ℃ in nitrogen. The temperature at 10% weight loss of the PI (T10) is as high as 480 ℃ in nitrogen. The PI film exhibited high transparency (95%) at wavelengths above 400 nm.