丙烯酸酯封端的取代氢键液晶的制备及性能研究  

Preparation and Investigation of Acryloxy-Capping Substituted Hydrogen-Bonded Liquid Crystals

作　　者：何万里[1] 曹晖[1] 张晓光[1,2] 杨光达[2] 杨洲[1] 杨槐[1] 

机构地区：[1]北京科技大学材料科学与工程学院材料物理与化学系,北京100083 [2]光电系统信息控制技术国家级重点实验室,河北三河065201

出　　处：《液晶与显示》2009年第6期783-788,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.20674005);国家"863"计划(No.2006AA03Z108);国家"863"平板显示专项(No.2008AA03A318);国家科技支撑计划(No.2007BAE31B02);光电系统信息控制技术国家级重点实验室基金(No.9140C150102090C1501)

摘　　要：合成了3种丙烯酸酯封端的取代苯甲酸以及其分别与4,4′-联吡啶和反式吡啶基乙烯自组装形成的双氢键液晶,采用傅立叶红外光谱(FTIR)和核磁共振法(1H-NMR)表征化合物的结构,使用偏光显微镜(POM)以及差示扫描量热仪(DSC)研究氢键液晶复合体的相转变行为。结果表明,在刚性液晶基元中引入氟原子会增加氢键液晶分子的宽度和降低分子的长径比对液晶材料的性能有很大影响,如降低氢键液晶的熔点以及清亮点等。另外,在柔性链末端引入丙烯酰氧基以及增加液晶基元的长度则会增加液晶分子的长度和规整性,提高氢键液晶复合体的相转变温度。Three kinds of acryloxy-capping substituted benzoic acid compounds were synthesized and characterized the corresponding symmetric hydrogen-bonded liquid crystals （H-boned LCs） based on 4, 4r- bipyridine （BP） or 4-（（E）-2-（pyridin-4-yl）vinyl）pyridine （DPE） were prepared. The structure of pre- cursors as well as the H-bond structures were confirmed by the 1H nuclear magnetic resonance （1H- NMR） and by Fourier transform infrared spectroscopy （FTIR）. The mesogenic behavior of the H- bonded complexes was demonstrated by the polarizing optical microscopy （POM） and the differential scanning calorimetry （DSC）. It was found that the fluoro substituent on the mesogenic core made the molecular width increased and thus the aspect ratio of the molecular decreased, therefore it could weaken the mesogenic behaviors of the H-bonded LCs such as decreasing the melting point as well as the clear point. Additionally, the introduction of terminal acryloxy group and the increase of induced rigid core could enhance the molecular length and regularity, resulting in the increase of phase transition temperatures of the complexes.

关 键 词：液晶 氢键 丙烯酸酯 氟取代 自组装 

分 类 号：O753.2[理学—晶体学]