Synthesis and mesomorphic properties of fluorinated Schiff's base liquid crystals containing vinyl end groups  

作　　者：Qiang Wei Siquan Zhu Lin Shi Lipei Zhang Xiaotao Yuan Hui Cao Huai Yang 

机构地区：[1]Materials Science and Engineering School, University of Science and Technology Beijing, Bcijing 100083, China [2]Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China

出　　处：《Journal of University of Science and Technology Beijing》2007年第4期373-377,共5页北京科技大学学报（英文版）

基　　金：the National High-Tech Research and Development Program of China (863 Program, No. 2003AA327050) ;the Major Project of Ministry of Education of the People’s Republic of China (No.104187).

摘　　要：Three kinds of fluorinated Schiff＇s base esters, 4-allyloxy-2-X-6-X-benzoic acid 4-[（2, 3, 4-trifluorophenylimino）methyl]phenyl ester, where X=H or F, were synthesized and characterized. Their chemical structures were identified by Fourier transform infrared spectroscopy （FTIR） and ^1H nuclear magnetic resonance （^1H NMR）. Their mesomorphic properties were studied by polarized optical microscopy （POM） and differential scanning calorimetry （DSC）. It was found that all the three compounds exhibited enantiotropic nematic phases only. And their cleating point temperature and thermal range of mesophase decreased with the number of fluorine atoms on the rigid core of the compounds; while their melting point temperature showed no distinct regularity.Three kinds of fluorinated Schiff＇s base esters, 4-allyloxy-2-X-6-X-benzoic acid 4-[（2, 3, 4-trifluorophenylimino）methyl]phenyl ester, where X=H or F, were synthesized and characterized. Their chemical structures were identified by Fourier transform infrared spectroscopy （FTIR） and ^1H nuclear magnetic resonance （^1H NMR）. Their mesomorphic properties were studied by polarized optical microscopy （POM） and differential scanning calorimetry （DSC）. It was found that all the three compounds exhibited enantiotropic nematic phases only. And their cleating point temperature and thermal range of mesophase decreased with the number of fluorine atoms on the rigid core of the compounds; while their melting point temperature showed no distinct regularity.

关 键 词：SYNTHESIS Schiff＇s base fluorinated liquid crystal vinyl end group 

分 类 号：TF141.6[冶金工程—冶金物理化学]