臺灣博碩士論文加值系統

本論文主要是以本實驗室已發表過之雙光軸液晶之文獻成果，作為衍生探討新穎性藍相液晶的分子設計與合成。其中液晶分子的設計為以本實驗室發表過之1,3,4-oxadiazole作為核心的香蕉型雙光軸液晶為基礎，再配合不同長度之軟鏈段來探討其液晶相，之後再導入具旋光性的軟鏈段嘗試誘導出藍相，分別為系列一的分子：OXD4f、OXD5f、OXD7f、OXD7f*。隨後改變其中一側硬段的苯環數，但其結構依然是不對稱的型態，並加入官能基氟以及具對掌性的軟鏈段，以此兩個官能基為基礎做出對照組，互相比較其性質並且嘗試誘導出藍相，分別為系列二的分子：OXD5B7、OXD5B7F、OXD5B7*。最後我們在系列一的分子中除了成功合成出具有BPIII性質的OXD7f*，也利用混摻的模式成功混出藍相之性質，其混摻過後所誘導出的藍相可由39℃持續到室溫。在系列二部分，則成功設計出單一分子具有BPIII的性質OXD5B7*，由於溫寬較為狹窄只能在POM上觀察出其BPIII的紋理圖，大約持續0.5℃左右。以上系列一及系列二的分子，我們利用POM、DSC、UV-Visible、光電性質量測及XRD來進行驗證分析其物性。

This thesis is based on our laboratory has published the results of literature on biaxial liquid crystal, as derived from the novel of blue phase liquid crystal molecular design and synthesis.
The liquid crystal molecules designed to allow the laboratory published 1,3,4-oxadiazole as the core of the banana-shaped biaxial liquid crystal, and use the soft chain of different lengths to explore the liquid crystal phases. And then import a chirality of soft chain try to induce blue phase. Series one of molecules: OXD4f, OXD5f, OXD7f, OXD7f*.
Then one side of the hard segment to change the number of benzene rings, but its structure is still asymmetry.Adding two functional groups fluorine and a chiral soft chain, as the basis of two functional groups to make control groups to compare their properties and try to induce blue phase. Series two of molecules: OXD5B7, OXD5B7F, OXD5B7*.
Finally, we successfully synthesized a molecule which have BPIII property in the series one ,and also useed a blended method successfully induce blue phase, which blue phase temperature range from 39℃ room temperature. In the series of two, we successfully designed a single molecule which have BPIII property.Because the BPIII temperature range is too narrow,we can only be observed its texture in the POM,the range only about 0.5℃.We used the POM, DSC, UV-Visible, measurement of photoelectrical properties and XRD to verify the physical properties of these liquid crystals.

摘要.............................................................I
Abstract.......................................................III
誌謝.............................................................V
目錄............................................................VI
圖目錄..........................................................IX
表目錄........................................................XIII
第一章序論.......................................................1
1-1前言..........................................................2
1-2液晶簡介......................................................4
1-2-1 液晶的發現.................................................4
1-2-2 液晶的分類.................................................5
1-3 香蕉型液晶...................................................9
1-3-1香蕉型液晶簡介 ..............................................9
1-3-2香蕉型液晶分子設計.........................................11
1-4 藍相液晶....................................................12
1-4-1 藍相液晶的簡介............................................12
1-4-2 高分子網狀結構穩定藍相....................................20
1-4-3 藍相液晶的分子設計........................................22
1-4-4雙光軸向列型液晶混摻旋光性摻雜體誘導藍相...................23
1-5雙光軸液晶...................................................26
1-6研究動機.....................................................30
第二章 實驗部份................................................33
2-1 實驗藥品及溶劑..............................................34
2-2實驗儀器設備.................................................36
2-3合成步驟總流程...............................................41
2-4合成步驟.....................................................45
第三章結果與討論................................................78
3-1 POM(偏光顯微鏡)的觀察.......................................79
3-1-1系列一化合物的POM觀察......................................79
3-1-2系列二化合物的POM觀察......................................82
3-2 DSC量測.....................................................84
3-2-1系列一化合物的DSC量測......................................85
3-2-2系列二化合物的DSC量測......................................90
3-3 分子系列一OXD7f*的單一分子與混摻討論........................95
3-3-1 混摻比例與POM觀察.........................................95
3-3-2 系列一單一分子以及混摻之光電量測 ..........................96
3-3-3 系列一混摻之穿透度量測....................................99
3-4 XRD的量測..................................................100
3-4-1系列一化合物之XRD的量測...................................100
3-4-2系列二化合物之XRD的量測...................................104
第四章 結論與未來展望..........................................107
結論與未來展望.................................................108
參考文獻.......................................................109
附錄...........................................................110
附錄A-DSC圖譜..................................................110
附錄B-NMR Spectropy ............................................116
附錄C- EA and Mass Spectropy ..................................121

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