Preparation and Characterization of Novel Polyimide with Thick Ring in Side Chain for Vertical Alignment Liquid Crystals
| Autor: | 郭春桔 Guo Chun-ju, 孙振 Sun Zhen, 汪映寒 Wang Ying-han, 夏森林 Xia Sen-lin |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
business.industry Analytical chemistry Ring (chemistry) Chloride Electronic Optical and Magnetic Materials chemistry.chemical_compound Optics chemistry Liquid crystal Diamine Signal Processing Alkoxy group Side chain medicine Thermal stability business Instrumentation Polyimide medicine.drug |
| Zdroj: | Chinese Journal of Liquid Crystals and Displays. 27:8-13 |
| ISSN: | 1007-2780 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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