- 作者: 林意毅 ; 陳克紹 ; 林山陽
- 作者服務機構: 大同工學院
- 中文摘要: A microscopic Fourier transform infrared spectrometer(Micro FTIR) equipped for differential scanning calorimetry(DSC) was used to measure simultaneously the chemical structural variation and the thermal response of phase transition of cholesteryl oleyl carbonate (COC). The differential scanning calorimeter served also to determine the phase transitions of COC during heating or cooling. Two endothermic features due to phase transition were found in the thermogram: 18.3.degree.C for a smectic- cholesteric transition and 37.5.degree.C for a cholesteric-isotropic transition during heating; 35.1.degree.C for an isotropic- cholesteric transition and 15.8.degree.C for a cholesteric- smectic transition during cooling. The breadth of the feature indicated sluggish phase transitions. The three- dimensional plot indicated that the intensities of lines due to the C-H stretching and scissoring deformation modes and C=O stretching mode of COC decreased suddenly near the temperature of phase transition during heating but the intensity of the line dues to the C-O stretching mode of carbonate ester of COC increased. Lattice vibrations or coupling of vibrational modes might be responsible for the result. These intensities in the cooling process varied inversely to those in heating process.
- 英文摘要: --
- 中文關鍵字: Cholesteryl Oleyl Carbonate; Thermophysical Property; Liquid Crystal; Microscopic Fourier Transform Infrared Spectrometry(Ftir); Differential Scanning Calorimetry (Dsc)
- 英文關鍵字: 膽固醇油酸酯;熱物理性質;液晶;顯微傅立葉變換紅外線光譜法;差示掃描測熱法