کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1674106 | 1008957 | 2008 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Polyimide photo-alignment layers for inclined homeotropic alignment of liquid crystal molecules Polyimide photo-alignment layers for inclined homeotropic alignment of liquid crystal molecules](/preview/png/1674106.png)
We have succeeded in realizing an inclined homeotropic alignment of liquid crystal (LC) molecules by using photo-aligned films of a polyimide containing azobenzene in the backbone structure. To induce such an LC alignment, a side chain structure was introduced into the backbone structure. The LC pretilt angle, measured from the surface normal, could be controlled up to 1.75° by varying the light exposure in oblique angle irradiation with unpolarized light. Its thermal stability was examined by annealing the LC cell at 100 °C. No change was observed in the pretilt angle even after annealing for 36 h, indicative of its excellent thermal stability. Since photo-alignment has patterning capability, the photo-aligned polyimide film is expected as a promising alignment film for multi-domain vertical alignment mode LC displays.
Journal: Thin Solid Films - Volume 516, Issue 9, 3 March 2008, Pages 2652–2655