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題 名 | 合成新型大傾斜角具廣溫度範圍之強誘電性液晶=Synthesis and Characterization of Novel Ferroelectric Liquid Crystalline with a Large Tilt Angle and Wide Temperature Range |
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作 者 | 吳念潔; 廖健同; 李俊毅; | 書刊名 | 技術學刊 |
卷 期 | 26:2 2011.06[民100.06] |
頁 次 | 頁105-111 |
分類號 | 440.34 |
關鍵詞 | 強誘電性行為; 有機矽氧烷; 大傾斜角; 溫度範圍廣; Ferroelectric behavior; Organosiloxane; Large tilt angle; Wide temperature range; |
語 文 | 中文(Chinese) |
中文摘要 | 本文在研究強誘電性行為的低分子量有機矽氧烷液晶材料。設計並合成一末端基上含寡聚物矽氧烷,並且結構核心為 4-hydroxyphenyl 4'-hydroxybiphenyl 4-carboxylate與 chiral octan-2-ol unit的液晶。此新型大傾斜角液晶具有廣泛旋光性 C型層列 (chiral smectic C, SmC*) 的溫度範圍,並藉由實驗鑑定出 SmC* 相。 此 SmC* 液晶相鑑定藉由正交偏光顯微鏡 (polarizing optical microscope, POM)、示差掃描熱量分析儀 (differential scanning calorimetry, DSC) 和 X光繞射分析儀 (X-ray diffractometer, XRD) 等光學儀器來測定液晶相特性,發現所設計液晶澄清點有下降的趨勢。 |
英文摘要 | The present paper is a study of the ferroelectric behavior in low molar mass organosiloxane liquid crystal materials. We have achieved the molecular design, synthesis and characterization of liquid crystals which have 4-hydroxyphenyl 4'-hydroxybiphenyl-4-carboxylate cores, chiral octan-2-ol units and oligomeric siloxane end-groups. A few novel compounds with large tilt angles and wide temperature ranges of SmC* phase have been synthesized, and the mesophases have been compared. The characteristics of the liquid crystal phases under discussion were investigated by means of polarizing microscopy, differential scanning calorimetry, X-ray diffraction and electro-optical experiments. The influence of the molecular structure on the occurrence of the SmC* phase was investigated. These substituents have a strong influence in reducing clearing temperatures and increasing temperature ranges. |
本系統中英文摘要資訊取自各篇刊載內容。