室溫型強誘電性液晶之合成

Synthesis of Novel Siloxane Room Temperature Liquid Crystalline

此篇文章目的為合成室溫型含矽氧烷之液晶材料，以 4'-hydroxybiphenyl-4-yl 4-hydroxybenzoate 為核心，在旋光基的選擇上使用了butyl 2-hydroxypropanoate，並在非旋光末端基加上矽氧烷，並對矽氧烷是否影響液晶相轉移行為及液晶相進行研究觀察。在實驗中利用偏光顯微鏡 （polarizing optical microscope,POM）、示差掃描式卡計 （differential scanning calorimeter, DSC）、X射線繞射儀 （X-ray diffraction, XRD） 進行化合物液晶相的鑑定與討論，發現該液晶澄清點溫度有下降的趨勢，並具有寬廣的液晶相溫度範圍，並於文中進一步探討該液晶結構對於液晶相 （SmC*） 的影響。

This article’s goal was to analyze the synthesis of room temperatureliquid crystal materials with low molar mass organosiloxane. The structurescontain 4'-hydroxybiphenyl-4-yl 4-hydroxybenzoate core and chiralbutyl 2-hydroxypropanoate unit, and organosiloxane on the end of theachiral molecules. A few novel series of room temperature compoundswere synthesized, and the mesophases exhibited by them were compared.The mesophases under discussion were investigated using polarizingmicroscopy, differential scanning calorimetry, and X-ray diffraction. Thesubstituent had a strong influence in reducing the clearing temperatures andincreasing temperature range. The influence of the molecular structure onthe occurrence of the SmC* phase was investigated in the article.