Full-Text Search:
Home|About CNKI|User Service|中文
Add to Favorite Get Latest Update

Preparation and Characterization of Novel Polyimide with Thick Ring in Side Chain for Vertical Alignment Liquid Crystals

GUO Chun-ju,XIA Sen-lin,SUN Zhen,WANG Ying-han(State Key Laboratory of Polymer Materials Engineering of China, College of Polymer Science and Engineering,Sichuan University,Sichuan 610065,China)  
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.
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©CNKI All Rights Reserved