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.用于显示器件的向列液晶的开发：一种新型U形液晶分子，其中两个极性介晶基团通过邻苯二酚连接，1-{6-(3,4-二氟苯氧基)己氧基}-2-{6-制备了[4-(4-氟苯基)苯氧基]己氧基}苯并研究了向列混合物的电光性能。结果发现，10wt％的U形化合物的阈值电压显着低于主体液晶(LC)的阈值电压，其原因在于介电各向异性的增加。 .U型体系是降低液晶材料阈值电压的一种新方法。2.具有宽蓝相区的新型手性液晶低聚物：我们设计了具有分子结构的手性液晶低聚物。我们制备了(R)-2,2'-双{6-[4-(2-(2-氟-4-丁氧基苯基)嘧啶-5-基)苯氧基]烷氧基}-1,1同系物。 '- … More 联萘基衍生物中具有偶数原子的联萘衍生物表现出手性向列相，而具有奇数原子的联萘衍生物表现出手性向列相。然后，我们制备了一种T型化合物，(R)-1-methylhepthy1-4'-{4-octyloxy-2-{11-[4-()。 5-辛基嘧啶-2-基)苯氧基]十一烷酰氧基}苯甲酰氧基}联苯-4-羧酸酯，发现其在较宽的温度范围内显示出蓝相3.具有分级结构的液晶低聚物：制备了一系列同系的新型λ型介晶化合物，其中三个介晶基团与3,4-二羟基苯甲酸连接。 4-双{6-[4-(5-辛基嘧啶-2-基)苯氧基]己氧基}苯甲酸酯被发现实现我们制备了一系列同源双介晶液晶，α-(4-氰基联苯-4'-基氧基)-ω-[4-(5-烷基嘧啶-2-基)苯基-4"-。发现交指型背斜近晶 C (SmCanti) 相被诱导。此外，在垂直排列的样品的 SmCanti 相中观察到条纹图案，当样品温度变化较小时，条纹图案会传播。