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Liquid crystalline polymers with banana mesogens-Polarity and chirality induced by their banana shape

具有香蕉介晶的液晶聚合物-由香蕉形状引起的极性和手性

基本信息

批准号：
15350130
负责人：
WATANABE Junji
金额：
$ 9.34万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

Liquid crystalline compounds with non-linear molecular shape, so-called banana-shaped molecules, have become a fruitful topic in liquid crystal researches since ferro-, anti-ferroelectricity and chrality were found in such achiral moleculear systems. A number of banana-shaped liquid crystalline molecules have been synthesized and studied by particularly modifying of the well-known banana-shaped molecule 1,4-phenylene [4-(4-n-alkoxypheny liminomethyl)benzoates, P-n-O-PIMB, subsequently, a variety of liquid crystalline phases and interesting properties have been revealed. In this study, we prepare a new homologous series of banana-shaped molecule containing oxadiazole core,2,5-bis(4'-n-alkylcarboxy biphenyl-4-yl)-[1,3,4]-oxadiazole (ODBBP-n) to extend the study on the polymeric banana molecules. To our knowledge, this is the first example of five-membered heterocyclic liquid crystalline molecule that exhibits banana class mesophase. In addition, the relationship between the bending geometry and mesomorphic behavior of ODBBP-n is also demonstrated by comparing with thiaziazole core derivatives. The results obtained simply described below.1)From the analysis of chiral memory between B2 and B4 phases, it was concluded that the spontaneously arising chirality is due to the chiral conformation characteristic of the banana shape.2)In ferroelectric B2 phase, the distinct layer undulation takes place as a result of the interplay between the spontaneous polarization and layer elasticity.3)In the banana molecules with the asymmetric alkyl tails, it was found that antiferroelectric phase is altered to the ferroelectric phase when two tail groups have the remarkable difference in their length.4)The extension of the study to the polymeric system failed because of the high temperature melting of polymer. Now, we try to synthesize the dimer and trimer of banana molecules.

具有非线性分子形状的液晶化合物，即所谓的香蕉形分子，自从在这种非手性分子系统中发现铁电性、反铁电性和色性以来，已成为液晶研究中富有成果的课题。通过对众所周知的香蕉形分子1,4-亚苯基[4-(4-n-烷氧基苯基亚氨基甲基)苯甲酸酯，P-n-O-PIMB进行特别修饰，合成并研究了许多香蕉形液晶分子，随后揭示了多种液晶相和有趣的性质。在本研究中，我们制备了一系列含有恶二唑核的新同系香蕉形分子，2,5-双(4'-n-烷基羧基联苯-4-基)-[1,3,4]-恶二唑(ODBBP-n)，以扩展对聚合香蕉分子的研究。据我们所知，这是第一个表现出香蕉类中间相的五元杂环液晶分子的例子。此外，通过与噻嗪唑核衍生物的比较，还证明了ODBBP-n的弯曲几何形状和介晶行为之间的关系。得到的结果简单描述如下。1)通过对B2和B4相之间的手性记忆的分析，得出结论，自发产生的手性是由于香蕉形状的手性构象特征造成的。2)在铁电B2相中，由于自发极化和层弹性之间的相互作用，发生了明显的层状起伏。3)在具有不对称结构的香蕉分子中发现当两个尾基长度有显着差异时,反铁电相转变为铁电相。4)由于聚合物的高温熔化,将研究扩展到聚合物体系失败。现在，我们尝试合成香蕉分子的二聚体和三聚体。

项目成果

期刊论文数量（40）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

液晶・高分子入門物性科学入門シリーズ

液晶和聚合物的物理性质介绍：科学简介系列

DOI：
发表时间：
2004
期刊：
影响因子：
0
作者：
竹添秀男;渡辺順次共著
通讯作者：
渡辺順次共著

Study on smectic liquid crystal glass and isotropic liquid grass formed by thermotropic main-chain liquid crystal polyester

近晶液晶玻璃及热致主链液晶聚酯形成的各向同性液晶玻璃的研究

DOI：
发表时间：
2004
期刊：
Macromolecules 37
影响因子：
0
作者：
M.Tokita;S.Funaoka;J.Watanabe
通讯作者：
J.Watanabe

Electric field induced transition between the polarization-modulated and ferroelectric smectic C_SP_F^* liquid crystalline stats studied using microbeam x-ray diffraction

使用微束 X 射线衍射研究偏振调制和铁电近晶 C_SP_F^* 液晶统计之间的电场诱导转变

DOI：
发表时间：
2004
期刊：
Phys.Rev.
影响因子：
0
作者：
M.Nakata;D.R.Link;Y.Takanishi;Y.Takahashi;J.Thisayukuta;H.Niwano;D.A.Coleman;J.Watanabe;A.Iida;N.A.Clark;H.Takezoe
通讯作者：
H.Takezoe

Local layer structures in circular domains of an achiral bent-core mesogen observed by X-ray microbeam diffraction

X 射线微束衍射观察到非手性弯曲核液晶元圆形域中的局部层结构