藍相液晶平面顯示器相較於傳統的顯示技術，具有高速反應時間、廣視角，且無需配向膜等優點，因此近年受到廣泛的注意。但由於典型的藍相液晶只能存在於狹窄的溫度範圍區間(約1K)，因此欲應用於快速的光調節器或顯示器等元件造成極大的不便。本論文之研究目標為藉由在具藍相的膽固醇液晶中利用添加高分子單體，並照光聚合作用，形成高分子穩定液晶藍相，以此改善藍相液晶只能存在於狹窄溫度範圍區間的問題，同時探討延長溫度範圍的理論模型。
本研究探討在不同聚合條件下造成的高分子型態對於藍相液晶的影響，達到延長藍相液晶溫度範圍的不同效果，並分析其影響藍相液晶不同溫度範圍的原因。本實驗利用控制樣品在不同曝光溫度及曝光強度的條件，來構成不同型態的高分子結構，並利用SEM 影像來分析了解其結構特性。我們由實驗結果可以得知，高分子結構對於藍相液晶的穩定扮演重要的因素，搭配理論模型，找到不同藍相液晶溫度範圍的規律性，本研究並成功地將藍相液晶的溫度穩定能存在室溫且超過140oC 的溫度範圍。基於此研究成果，未來能將不同溫度範圍的藍相液晶應用於各式光電元件上。

“Blue phase” LCD panels features the advantages of superior response times、wide viewing angle and no requirement for alignment by rubbing greater than conventional LCD modes. Thus, recently several groups have been developed both scientific and technological interests in the blue phases. However, the blue phases only exist in the narrow temperature
range, typically a few Kelvin below the phase transition temperature of materials, which has been a problem for practical applications such as fast light modulators or display. In this paper, we proposed polymer-stabilized liquid crystalline blue phase by photopolymerizing the monomers in the isotropic phase and discussed the theoretical model to describe the stability of the blue phases. The polymer networks play an important role in stabilizing a liquid crystal blue phase. The morphology of polymer network was determined by the process of polymerization condition, like exposure intensity and
temperature. Moreover, scanning electron microscopy (SEM) images were used to understand directly the network structures and to find the regularity of temperature intervals. In the meantime, we successfully extended the temperature range of blue phase over 140oC under suitable conditions.
Based on this research results, the different temperature interval properties of cholesteric blue phases will apply on various photoelectric elements in the future.

摘要……………………………………………………………………….Ⅰ
Abstract……………………………………………………………….......Ⅱ
致謝……………………………………………………………………….Ⅲ
目錄……………………………………………………………………….Ⅳ
圖目錄…………………………………………………………………….Ⅶ
表目錄………………………………………………………………….…Ⅹ
第一章 緒論……………………………………………………………….1
第二章 液晶及藍相液晶簡介
2-1 液晶(Liquid Crystals)簡介
2-1.1 何謂液晶………………………………………………....2
2-1.2 液晶的分類…………………………………………........3
2-1.3 液晶的物理特性………………………...….………........7
2-1.4 液晶高分子……………………………...……………...11
2-2 藍相(Blue Phases)液晶簡介
2-2.1 藍相液晶的發現……………………………………….13
2-2.2 何謂藍相液晶…………………………………………..13
2-2.3 藍相液晶的結構特性………………………………….14
2-2.4 藍相液晶的判別方法………………………………….18
第三章 理論介紹
3-1 高分子結構下之藍相液晶……...……........................................20
3-2 高分子穩定藍相(Polymer-stabilized blue phase, PSBP)……….22
3-3 高分子穩定各向同性相(Polymer-stabilized isotropic phase,
PSI)…………………………………………………...………….24
第四章 實驗方法與過程
4-1 材料介紹………………………………………………………...28
4-2 聚合反應機制及實驗變數…………………………...…………30
4-3 PSI 元件製作……………..……………………………………...33
4-4 SEM樣品準備…………………………………………………...37
第五章 結果與討論
5-1 純BP 元件與PSI 元件之比較
5-1.1 相轉換溫度及反射光譜量測…………………………..39
5-1.2 偏光顯微鏡下的情形………..........................................41
5-2 有無照光高溫之聚合反應分析………………………………...44
5-3 SEM 圖像觀察及分析
5-3.1 相同曝光溫度但不同曝光強度之比較分析…………..47
5-3.2 相同曝光強度但不同曝光溫度之比較分析…………..49
5-4 不同曝光強度及曝光溫度對藍相液晶溫度之影響
5-4.1 總SEM 圖像分析及相轉換溫度序列圖………………52
5-4.2 藍相液晶溫度範圍結果總比較………………………..53
第六章 結論與未來展望………………………………………………...56
參考文獻………………………………………………………………….58

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