抄録
Study on molecular orientation changes by phase transition is important to reveal the stability mechanism of chiral nematic liquid crystal (N^*LC) exhibiting blue phases (BPs) and developing of new generation LC devices as well. In this study, the polarized microscopic FT-IR spectroscopy has been applied for study on molecular orientation of N^*LC by the phase transition. The vertical and in-plane molecular orientation change of NLC molecules have been determined by band intensity ratio CN/CH_2 of non-polarized IR spectra and band intensity of CN stretching mode of polarized IR spectra, respectively. In conclusion, the lattice of BP I is more likely to affect the molecular orientation change of N^*LC on cooling process.
