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Development in electrical and optical properties of organic materials by 3-D structural control using dendrimer as a command molecule.

使用树枝状聚合物作为命令分子，通过 3D 结构控制开发有机材料的电学和光学性质。

基本信息

批准号：
18550186
负责人：
YONETAKE Koichiro
金额：
$ 2.6万
依托单位：
Yamagata University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Drimers are well defined highly branched, three-dimensional compounds with a large number of reactive end groups. Moreover, these reactive end groups easily react with many reagents to give dendrimers with various functionalities on the surface. Thus, they are receiving interest as new polymeric materials whose properties should differ significantly from those of linear polymers. Generally, dendrimers are amorphous due to highly branched molecules. Introduction of liquid crystalline derivatives to their terminal groups gives them liquid crystalline nature. The liquid crystalline dendrimers can be aligned by applying external field such as magnetic or electric fields. We have synthesized poly (propyleneimine) dendrimers (1st, 2nd, and 3rd generation) having peripheral azobenzene and phenylnaphthalene derivatives, and examined the phase transition behavior, liquid crystalline structure, photoisomerization and carrier transport property. The azobenzene deindrimers exhibite smectic A (SmA) … More phase, and the SmA/isotropic phase transition temperature increases with increasing generation. Cis-trans photoisomerization was observed in the chloroform solution and film at room temperature under UV and visible light irradiation. During the cis-trans photoisomerization, a homeotropic alignment was formed in the film. In addition, the photoinduced surface relief could be formed on the films by irradiating visible light. Therefore, the diffraction grating can be made by surface relief and molecular alignment using azobenzene dendrimers The dendrimers having peripherally phenylnaphthalene derivatives exhibited smectic liquid Crystalline nature at room temperature. The phase transition, structures, and carrier transport property of the dendrimers have been examined. They exhibited the carrier mobility of 10^<-3>cm^<2>/Vs at room temperature (SmEphase). The values are equivalent to that of the low-molecular liquid-crystalline phenylnaphthalene derivatives. Thus, the dendrimer backbone can avoid crystallizing and exhibit high carrier transportation at room temperature. Moreover, the phenylnaphthalene dendrimers also form a homeotropic structure on the substrate. The homeotropic alignment seems to be better for the construction of vertical type transistor. Less

催干剂是具有大量反应性端基的明确定义的高度支化的三维化合物。此外，这些反应性端基容易与许多试剂反应，以在表面上产生具有各种官能度的树枝状聚合物。因此，它们作为新的聚合物材料受到关注，其性质应与线性聚合物的性质显著不同。通常，树枝状聚合物由于高度支化的分子而为无定形的。液晶衍生物在其末端基团的引入赋予它们液晶性质。液晶树枝状聚合物可以通过施加诸如磁场或电场的外部场来取向。我们合成了外围含有偶氮苯和苯基萘衍生物的聚丙烯亚胺树枝状大分子（第一、第二和第三代），并研究了其相变行为、液晶结构、光致异构化和载流子输运性质。偶氮苯类脱茚聚合物在近晶A（SmA）中的分散性 ...更多信息相，并且SmA/各向同性相变温度随着代的增加而增加。在室温下，在紫外和可见光照射下，氯仿溶液和薄膜中观察到顺反光异构化。在顺-反光致异构化过程中，薄膜中形成了垂面排列。此外，通过可见光照射，可以在薄膜上形成光致表面浮雕。因此，衍射光栅可以通过表面浮雕和分子取向使用偶氮苯树枝状聚合物。具有外围苯基萘衍生物的树枝状聚合物在室温下表现出近晶液晶性质。研究了树枝状大分子的相变、结构和载流子输运性质。它们在室温下表现出10^ cm^ /Vs的载流子迁移率<-3><2>（SmEphase）。这些值与低分子液晶苯基萘衍生物的值相当。因此，树枝状聚合物主链可以避免结晶并在室温下表现出高载流子传输。此外，苯基萘树枝状聚合物还在基底上形成垂面结构。垂直排列似乎更适合于构造垂直型晶体管。少