臺灣博碩士論文加值系統

本實驗室於去年成功合成出液晶分子H-EI6摻混旋光摻混劑ISO(6OBA)2能使藍相溫寬超過30度及C6OBiPhI-OH摻混旋光摻混劑S811後能使藍相溫度接近室溫(36oC)。因此我們以席夫鹼衍生物為主體，製備兩種席夫鹼連結基團(-C=N-， -N=C-)的液晶主分子，並在酯基和席夫鹼旁導入氫氧基，使分子含有一種或兩種的分子內氫鍵。通過變溫XRD和POM的特徵紋理證實了這些外消旋聯苯液晶原的中間相，然後以反射光譜鑑定BPI與BPII的相變。接著藉由摻混旋光劑S811與ISO(6OBA)2觀察這兩種的分子內氫鍵對藍相之影響。實驗結果顯示於系列I (-C=N-) 的化合物中不論在酯基或席夫鹼旁有分子內氫鍵，在摻混旋光劑S811與ISO(6OBA)2後能降低藍相的生成溫度。於系列III(-N=C-)的化合物中摻混旋光劑S811時，若只有在席夫鹼旁有分子內氫鍵則不會有藍相生成。摻混旋光劑ISO(6OBA)2時，則須同時在酯基與席夫鹼旁有分子內氫鍵才會有藍相生成。

Two kinds of intramolecular hydrogen bonding by hydroxyl group with Schiff base or ester group were successfully incorporated into two types of rod-like Schiff base mesogens with -C=N- or -N=C- linkage. These Schiff base are doped with chiral additives S811 and ISO(6OBA)2 to investigate the effect of hydroxyl group position of rodlike Schiff base mesogen on the formation of blue phase (BP). The results show that the presence of intramolecular hydrogen bonding by hydroxyl group with Schiff base or ester group in Schiff base mesogen of series I (-C=N-) reduced BP formation temperature and narrow BP range when Schiff base mesogen is doped with chiral additives S811 or ISO(6OBA)2. For series III(-N=C-), BP could not be induced in the presence of only intramolecular hydrogen bonding between hydroxyl group and Schiff base in the mesogen of series III when chiral dopant S811 is added. Notably, BP emerges when two types of intramolecular hydrogen bonding by hydroxyl group with Schiff base and ester group both exist in Schiff base mesogen of in series III.

目錄
致謝 I
Abstract II
中文摘要 III
目錄 IV
圖目錄 VI
表目錄 IX
第一章 前言 1
1.1 液晶的簡介 1
1.2 液晶相的種類及排列 1
1.2.1不具光學活性液晶 1
1.2.2 具光學活性液晶 2
1.2.3挫敗相(Frustrated phase) 3
1.3文獻回顧 4
1.4 研究動機 9
第二章 實驗 11
2.1光譜分析 11
2.2 液晶與物理性質 11
2.3藥品 12
2.4 化合物 A的合成 13
2.5 EI6系列席夫鹼液晶合成 14
2.6 化合物B的合成 16
2.7 化合物 C的合成 17
2.8 化合物 D 的合成 18
2.9 EIII6系列席夫鹼液晶的合成 19
2.10理論計算 21
第三章 結果與討論 22
3.1 合成步驟的探討 22
3.1.1化合物 A的合成 22
3.1.2 EI6系列 24
3.1.2化合物 B的合成 25
3.1.3化合物 C的合成 27
3.1.4化合物 D的合成 28
3.1.5 EIII6系列 29
3.2 席夫鹼液晶的相變 31
3.3 探討席夫鹼液晶的官能基團添加旋光摻混劑S811對於藍相液晶範圍的影響 35
3.4 探討席夫鹼液晶的官能基團添加旋光摻混劑ISO(6OBA)2對於藍相液晶範圍的影響 37
3.5 藍相一與藍相二間的相變 39
3.6 理論計算 41
第四章 結論 46
附錄 46
參考文獻 53

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