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Photo-reactive polymer films for rubbing-free alignment of liquid crystals

用于液晶无摩擦取向的光反应聚合物薄膜

基本信息

批准号：
07555676
负责人：
ICHIMURA Kunihiro
金额：
$ 2.18万
依托单位：
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

It was demonstrated that linearly polarized light irradiation of films of polymers with azobenzene side chains determines the uniaxial orientation of nematic liquid crystals (LCs). In this fiscal year, the followings have been revealed.1. Benzylidenephthalimidines (BPI) having a skeleton related to stilbenes display E/Z photoisomerization and [2+2] photodimerization. It was confirmed that both photochemical reactions take place in thin films of polymethacrylates with BPI side chains. The thermal stability of homogeneous alignment of LCs induced by the photoirradiated films was influenced by the level of photocrosslinkage.2. It was observed that slantwise irradiation of films of azobenzene polymers results in the emergence of dichroism even though actinic light is not linearly polarized. The orientational direction of azobenzene chromophores was determined by the direction of light incidence. This technique using slantwise photoirradiation generated pretilt angles of LCs, demonstrating that rubbing-free production process of LC-aligning films is available solely by a photochemical way.

研究表明，线偏振光照射含偶氮苯侧链的聚合物薄膜，决定了液晶的单轴取向。于本财政年度，以下各项已披露。苯亚甲基邻苯二甲酰亚胺（BPI）具有与芪类化合物相似的骨架，具有光致异构和[2+2]光二聚作用。据证实，这两个光化学反应发生在薄膜中的聚甲基丙烯酸酯与BPI侧链。光交联程度影响光辐照液晶膜的热稳定性.据观察，倾斜照射的偶氮苯聚合物的膜的结果在出现的二向色性，即使光化光不是线性偏振的。偶氮苯发色团的取向方向由光的入射方向决定。该技术使用倾斜光照射产生LC的预倾角，表明LC取向膜的无摩擦生产过程仅通过光化学方式是可用的。