一类含氟希夫碱液晶的合成及中间相性能  

Synthesis and mesomorphic properties of fluorinated Schiff base liquid crystals

作　　者：魏强[1] 曹晖[1] 朱思泉[2] 原小涛[1] 张立培[1] 杨槐[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首都医科大学附属北京同仁医院眼科中心,北京100730

出　　处：《北京科技大学学报》2008年第3期285-288,共4页Journal of University of Science and Technology Beijing

基　　金：2004年教育部重点项目(No104187);北京科技计划项目(NoY0405004040121);北京腐蚀、磨蚀与表面技术重点实验室资助项目

摘　　要：合成了一系列希夫碱酯类化合物——4-(4-烷基反式环己基)苯甲酸4-(2,3,4-三氟苯胺亚甲基)苯酚酯.通过红外光谱(FTIR)和氢核磁共振(1HNMR)对产物化学结构进行了确认,并采用偏光显微镜(POM)和差示扫描量热仪(DSC)对其中间相性能进行了研究.结果表明,所得产物均存在近晶相和向列相且清亮点均高于300℃;随着烷基链长度增加,其熔点降低,但对清亮点的影响不大,近晶相存在的温度范围增大,而向列相温度范围缩小.A series of fluorinated Schiff base ester liquid crystals, 4-（4-alkyl-trans-cyclohexyl）-bensoic acid 4-[ （2, 3, 4-trifluorophenylimino）-methyl]-phenyl ester, were synthesized. 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 calorimeter （DSC）. It was found that all the four compounds showed nematic and smectic properties and possessed high clearing point over 300℃. And with the increase of the length of alkyl chain, the thermal range of nemarie phase and clearing point temperatures decreased, while the smectic-nematic transition temperature and thermal range of smectic phase increased, but their melting point temperatures showed no distinct regularity.

关 键 词：含氟液晶 希夫碱 酯类液晶 相变温度 热稳定性 

分 类 号：O621.24[理学—有机化学]