Abstract
To improve effectiveness of photo-alignment, new polyimides containing cyclobutane-1, 2, 3, 4-tetracarboxylic dianhydride (CBDA) were designed including 4, 4′-diaminobenzophenone (DABP) and carbohydrazide by amide bond. For evaluating polyimides, a mole ratio of 4, 4′-diaminobenzophenone(DABP) and carbohydrazide was controlled to 0:100, 30:70, 50:50, 70:30, 100:0. The mixed solid contains 15wt% of solvent which is n-methyl-2-pyrrolidone (NMP). The synthesized polyimide was analyzed using the Fourier transform infrared (FT-IR). We obtained polar dichroic ratios and evaluate alignment of liquid crystal. For more aggressive photo-decomposition of polyimide, the photoreactions employing triplet mechanism and the double fragmentation reactions were carried out.
Acknowledgment
This work was supported by the Technology Innovation Program (201210940003, Materials Development for 50-inches UD OLED TV Using Super Hybrid Process) funded by the Ministry of Knowledge Economy (MKE, Korea).