We studied the liquid crystal (LC) alignment and pretilt angle generation for a nematic (N) LC using a photodimerization method on various new photo-crosslinkable polyimide based polymer. A good thermal stability of the photopolymers was measured by thermogravimatric analysis (TGA) measurement until 450C. High pretilt angle of the NLC was obtained by polarized UV exposure on the photopolymers containing biphenyl (BP), decyl (de), and cholesteryl (chal) group, respectively. However, low pretilt angle of the NLC was measured by polarized UV exposure on the photopolymers containing fluorine and chalcone group. The high NLC pretilt angle generated is attributable to the biphenyl, alkyl moieties, and photodimerized chalcone group of the photopolymer. Also, a good the electro-optical (EO) characteristics in the TN-LCD photoaligned with UV exposure of 30 on the photopolymer surface can be achieved.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics