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Coating Films of Liquid Crystalline polymers as Alignment Layrs

作为取向层的液晶聚合物涂膜

基本信息

批准号：
08455092
负责人：
NAKAMURA Kiyoji
金额：
$ 4.74万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455092/
关键词：
Liquid crystalline polymers Coating Alignment layr Numerical simulation Doi model Band texture AFM Morphology テクスチャーリビング自由境界

项目摘要

We tried to develop a new alignment layr by using a coating film of luquid crystalline polymers. Aqueous solutions and ethanol solutions both in isotropic and liquid crystalline states were used as coating materials. Results obtained in the present work are as follows.1. The ribbing phenomenon was occurred and its number per unit length increased with increasing velocity of coating and decreasing film thickness.2. The band texture was observed in the thin films processed from the liquid crystalline solutions at high coating velocities.3. The disclination line, which indicates that the molecules of liquid crystals align in a one direction on a coating film, was found in a droplet of 5CB placed on the coating film processed from isotropic solutions if the film is thin and the coating velocity is high. On the contrary, it was confirmed that the alignment state was random for thick films processed at low coating velocities.4. The surface morphology of coating films was measured with an atomic force microscope (AFM). The micro ribs, which corresponded to the band texture, was found. Any structures, which induced the molecular alignment of 5CB,were not able to be specified in the other films.5. In the numerical simulation of spinning flow of liquid crystalline polymers using the Doi model, molecules align parallel to the flow direction in the region close to the filament surface because of the elongational flow.6. We concluded that the molecular alignment of 5CB on the films processed from the isotropic solutions was caused by the flow-induced alignment of HPC molecules fixed only in the vicinity of the film surface.

我们尝试用液态结晶聚合物的涂膜来开发一种新的取向膜。以各向同性和液晶态的水溶液和乙醇溶液作为涂层材料。本工作取得的主要成果如下：1.随着涂布速度的增加和膜厚的减小，薄膜中出现了棱纹现象，单位长度上棱纹的数量增加.在高涂布速度下，由液晶溶液制备的薄膜中观察到带状织构.如果膜薄且涂布速度高，则在放置在由各向同性溶液处理的涂布膜上的5CB液滴中发现向错线，该向错线表示液晶分子在涂布膜上沿一个方向排列。相反，在低涂布速度下，厚膜的取向状态是随机的.用原子力显微镜（AFM）测量了涂层膜的表面形貌。发现了对应于带状织构的微肋结构，而其他薄膜中没有发现任何能诱导5CB分子取向的结构.在用Doi模型对液晶聚合物纺丝流动进行数值模拟时，由于拉伸流动，在靠近长丝表面的区域分子排列方向与流动方向平行.我们的结论是，从各向同性的解决方案处理的薄膜上的5CB的分子取向是由流动诱导的HPC分子的取向固定在附近的膜表面。