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中文摘要：
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12h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400nm以上具有高的透过率,可达95%以上。
英文摘要：
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.
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