Dynamic molecular design for liquid-crystalline materials with a fast response speed

响应速度快的液晶材料动态分子设计

基本信息

批准号：
15550156
负责人：
YOSHIZAWA Atsushi
金额：
$ 2.37万
依托单位：
Hirosaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

1.Development of nematic liquid crystals for display devices : A novel U-shaped liquid-crystalline molecule where two polar mesogenic groups are connected via catechol,1-{6-(3,4-difluorophenyloxy)hexyloxy}-2-{6-[4-(4-fluorophenyl)phenyloxy]hexyloxy}benzene, was prepared and the electrooptic properties were investigated. The threshold voltage of a nematic mixture consisted of a host liquid crystal (LC) and 10wt% of the U-shaped compound was found to be markedly lower than that of the host LC. Marked reduction in threshold voltage by the compound was found to be attributed to the increase in dielectric anisotropy. The U-shaped system is a novel approach for the reduction in the threshold voltage of liquid-crystalline materials.2.Novel chiral liquid crsyatls with a broad blue phase region : We designed chiral liquid crystal oligomers possessing molecular biaxiality. We prepared a homologous series of (R)-2,2'-bis{6-[4-(2-(2-fluoro-4-butyloxyphenyl)pyrimidine-5-yl)phenyloxy]alkyloxy}-1,1'- … More binaphthyl. The binaphthyl derivatives with an even number of atoms in the spacers showed a chiral nematic phase, however, those with an odd number of atoms showed a blue phase in a relatively wide temperature range between the isotropic and SmA phases. Then, we prepared a T-shaped compound, (R)-1-methylhepthy1-4'-{4-octyloxy-2-{11-[4-(5-octylpyrimidin-2-yl)phenoxy]undecanoyloxy}benzoyloxy}biphenyl-4-carboxylate, which was found to show a blue phase with a wide temperature range on cooling.3.Liquid crystal oligomers with a hierarchical structure : A homologous series of novel λ-shaped mesogenic compounds in which three mesogenic groups are connected to 3,4-dihyrdoxybenzoic acid has been prepared. 4-Cyanobiphenyl-4'-yl 3,4-bis{6-[4-(5-octylpyrimidm-2-yl)phenyloxy]hexyloxy}behzoate was found to realize an incommensurate SmA (SmAinc) phase. We prepared a homologous series of bimesogenic liquid crystals, α-(4-cyanobiphenyl-4'-yloxy)-ω-[4-(5-alkylpyrimidine-2-yl)phenyl-4"-oxy]alkane (mPYnOCB). The interdigitated anticlinic smectic C (SmCanti) phase was found to be induced for some binary mixtures betweeen the bimesogenic compounds with a different odd-numbered spacer. Furthermore, a striped pattern was observed in the SmCanti phase of a homeotropically aligned sample. The striped pattern was propagated when the temperature of the sample was varied. Less

1。用于显示器的列液晶的开发：一种新型的U形液晶分子，其中两个极性间质组通过儿茶酚1- {6- {6-（3,4-二氟苯甲氧基）己氧基} -2-2- {6- [4-（4-氟）苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基苯基二氧化碳。研究了电流特性。列型混合物的阈值电压由宿主液晶（LC）组成，U形化合物的10wt％明显低于宿主LC的阈值。发现该化合物的阈值电压显着降低归因于膳食各向异性的增加。 U形系统是一种新颖的方法，用于降低液体结晶材料的阈值电压。2。Novel手性液体crsyatls具有广阔的蓝相区域：我们设计了具有分子双轴性的手性液晶寡聚体。我们准备了一系列（r）-2,2'-bis {6- [4- [4-（2-（2-氟-4-4-4-甲苯苯基）嘧啶-5-基）苯羟基苯二氧化甲氧基]酸性] - 1,1,1'--更多二脂。隔离剂中具有均匀数量原子的双乙酰基衍生物表现出手性列相，但是，具有奇数原子的固有阶段在各向同性和SMA相之间的温度范围相对较宽。然后，我们制备了T形化合物，（R）-1-甲基Hepthy1-4' - {4- octyloxy-2- {11- {11- [4-（5-辛基二酰二酰基-2-基）苯氧基苯氧不是蛋白氧基] undecanoyloxy} undecanoyloxy} undecanoyloxy} benzoyloxy} binzoyloxy} biphenyl-4-4-甲基辅助量，并在其上均匀地进行了蓝色序列。具有层次结构的晶体低聚物：一系列同源的新型λ形性化合物，其中三个中源性基团与3,4-二羟基苯甲酸相连。 4-Cyanobiphenyl-4'-yl 3,4-bis{6-[4-(5-octylpyrimidm-2-yl)phenyl-4"-oxy]alkane (mPYnOCB). The interdigitated antiticlinic smectic C (SmCanti) phase was found to be induced for some binary mixes betweeen the bimesogenic compounds with a different odd-numbered spacer.此外，当样品的温度变化时，在同型彼此对准样品的SMCANTI相中观察到条纹模式