理論計算顯示雙軸性向列型液晶分子較單軸性向列型液晶分子於電場中有更快的應答時間，因此若應用於顯示器可大幅改善影像遲滯現象。本篇研究利用修改X狀以及盤狀向列型液晶分子的幾何形狀並引入極性單元，藉由引進強偶極產生分子間強偶極作用力，使得分子於空間中穩定排列成具雙光軸超分子結構。首先針對修改分子幾何形狀以及引入極性單元對形成雙軸性液晶的影響，接著利用偏光顯微鏡觀測以光學錐光偏振鏡檢法驗證雙軸性，並於磁場配向下以粉末X光繞射進一步證明雙軸性向列液晶相的存在。

It was proposed by theory that biaxial liquid crystals are predicted to exhibit significantly shorter switching time than uniaxial ones used in liquid crystal displays. In this thesis, modify the structural and incorporate a polar group onto cross-like and disc-like mesogens for the generation of biaxial nematic phases with stronger intermolecular dipole interaction. Their biaxiallity was envestigated and verified by conoscopic and X-ray diffraction studies.

目錄
目錄------------------------------------------------------------
III
圖表目錄--------------------------------------------------------
IV
附圖目錄--------------------------------------------------------
XI
第一章 簡介
1-1 液晶簡介--------------------------------------------------
1
1-2 液晶分類--------------------------------------------------
3
1-2-1 桿狀液晶---------------------------------------------
3
1-2-2 盤狀液晶---------------------------------------------
5
1-3 研究動機--------------------------------------------------
7
第二章 實驗與合成
2-1 儀器設備--------------------------------------------------
18
2-2 實驗藥品--------------------------------------------------
22
2-3 實驗簡介--------------------------------------------------
24
2-4 合成步驟--------------------------------------------------
25
第三章 結果與討論
3-1 合成討論--------------------------------------------------
36
3-2 化合物物性討論
3-2-1 液晶性質探討-----------------------------------------
42
3-2-1-1 粉末X光繞射-----------------------------------------
54
3-2-1-2 雙光軸向列相之鑑定-----------------------------------
58
結論------------------------------------------------------------
71
參考資料--------------------------------------------------------
73
附錄------------------------------------------------------------
75

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