Abstract
A homologous series of cholesteryl biphenyl ester derivatives was prepared. The thermal behaviors of compounds were studied by differential scanning calorimetry and by polarizing microscope equipped with a hot-stage. The cholesteric phase is present in all the compounds, whereas the smectic one is absent in the compounds with R = 1 and 2. The compounds possessed higher phase transitiof' temperature and wider temperature range of meso phase in comparison with known cholesteric liquid crystal phases.
본 연구에서는 Cholestery1 bipheny1 ester계열 화합물을 합성하여 편광현미경이 부착된 hot-stage와 시차열분석기로 물성을 조사하였다. 이 계열 화합물들은 모두 콜레스테릭 액정상을 나타내며, 알콕시 사슬 3번부터 스메틱상이 형성됨을 보여 준다. 또한, 일반적인 콜레스테릭 액정화합물에 비해 높은 상전이 온도를 보유하고 있으며, 넓은 온도 범위에 걸쳐 액정상을 나타낸다.