Pretilt angles and alignment stability for nematic liquid crystal (NLC) with obliquely polarized UV exposure on the three kinds of photo-polymer were studied. The generated pretilt angle of the NLC was about 2.7° by polarized UV exposure on a PM4Ch (poly(4-methacryloyloxy chalcone))surface for 1 min. But, the low pretilt angle for NLC on a PVCi (poly(vinyl)cinnamate) surface was observed. The pretilt angle generated in NLC is attributed to the photosensitivity by long side chain of the photo-polymer. Also, good thermal stability of the three kinds of photo-polymer were measured until 300 °C by thermogravimetric analysis (TGA) measurement. Finally, the good LC aligning capabilities using the photodimerization method were observed by annealing-treatment until 150 °C.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)