Synthesis of Polyurethane modified Acrylic Resins for the Applications of Liquid Crystal Alignment Layers
| Autor: | Shih-Chi Tsai, 蔡仕琦 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Nowadays, rubbing is the most common method to fabricate alignment layers. But it still exists a lot of drawbacks, such as static electricity and contaminants which will deteriorate the quality of LCD. In this work, we synthesize two kinds of polyurethane modified acrylates which are D-UAs and F-UAs. And the soft embossing method is proposed to fabricate grating structure on surfaces of polyurethane modified acrylate resins. This method provides a convenient and rapid way to make alignment layers. By water contact angle measurements and the optical micrographs of liquid crystal alignment taken between crossed polarizers, we find that the D-UARs surface is hydrophilic and the LC alignment is planar and that the F-UARs surface is hydrophobic and the LC alignment is homeotropical. The alignment ability relates to surface property and surface structure. Thus, we mix D-UAs and F-UAs with different ratio to modify the surface property. And we can control the LC pretilt angle successfully by the modifications of surface chemical properties under fixed surface topography and liquid crystal type. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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