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研究生： 王儷珊
Li-shan Wang
論文名稱： 經紫外光垂直配向之液晶混合系統的相轉移行為與光電特性探討
Phase-Transition Behaviors and Electro-Optical characteristics of the Liquid Crystal Mixtures System with Ultra-Violet Photo-alignment Process
指導教授： 李俊毅
Jiunn-Yih Lee
口試委員: 邱士軒
Shih-Hsuan Chiu
呂傑夫
CHIEH FU LU
學位類別： 碩士
Master
系所名稱： 工程學院 - 材料科學與工程系
Department of Materials Science and Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 中文
論文頁數： 62
中文關鍵詞： 雙旋光性 、液晶 、垂直配向 、相轉移行為 、灰階特性
外文關鍵詞： double chiral centres, liquid crystal, vertical alignment, phase-transition behaviors, gray-scale characteristics
相關次數： 點閱：211  下載：0 
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    • 本研究是利用具乳酸結構的雙旋光性液晶材料，以偏光顯微鏡(Polarizing optical microscope, POM)觀察此液晶材料從等向性溫度(Isotropic temperature)降溫至出現旋光性層列型液晶相(Chiral smectic A phase, SmA*)時，呈現垂直紋理(Homeotropic texture)的液晶相；藉由 SmA*相液晶材料摻入適當比例之光致垂直配向型負誘電異方性液晶與壓克力單體混合系統，以達到輔助液晶分子整體垂直排列之特性，並且探討不同的 SmA*摻混比例之液晶混合系統，於垂直配向模式下，利用POM來觀察液晶分子排列的情況及示差掃描熱分析儀(Differential scanning calorimete, DSC)量測液晶相轉移溫度與變化，及對此液晶混合系統之光電特性影響與探討，如：光穿透度、應答時間、灰階特性、介電常數、介電損耗等等。

    This study of the use of synthetic lactic acid structures with double chiral centres liquid crystal (LC) material, in the experiment with polarized optical microscopy (POM) observation of the liquid crystal material from the isotropic temperature down to appear chiral smectic A phase (SmA*), it will produce the homeotropic texture of the LC phase; So, we hope that the SmA* phase LC materials by mixing photo-induced vertical alignment (VA) of the negative dielectric anisotropy LC (Nematic type LC)/acrylic monomer mixture systems, in order to auxiliary LC molecules to achieve the overall effect of the vertical arrangement of one of the main purpose of this experiments. The LC mixture systems in this VA mode, we observe the LC molecules arrangement condition by POM and the use of differential scanning calorimeter (DSC) to investigate the LC phase-transition behaviors. Finally, for the preliminary gray-scale characteristics of the LC mixture systems is also being explored.

    中文摘要…………………………………………...............................I 英文摘要……………………………………………….....……....….II 第一章 緒論.........................................................................................1 1-1 液晶的發現……………….............................................1 1-2 液晶的分類…………….................................................3 1-2-1 棒狀液晶相…………………..............................4 1-2-2 盤狀液晶相……………………………..............9 1-3 液晶分子配列與配向方………..………..….................9 1-4 實驗動機與目的……………………………………...13 1-5 垂直配向技術應用…………………………...............17 第二章 實驗方法………………………………...............................20 2-1 實驗材料與設備...........................................................20 2-1-1 實驗材料............................................................20 2-1-2 實驗設備............................................................21 2-2 實驗流程圖...................................................................23 2-3 液晶材料摻混系統.......................................................24 2-4 配向機制.......................................................................26 2-5 儀器分析理論...............................................................27 2-5-1 示差掃描熱分析儀............................................27 2-5-2 液晶元件顯示狀態............................................28 2-5-3 光穿透值量測....................................................29 2-5-4 應答時間量測....................................................31 2-5-5 介電性質量測....................................................33 第三章 結果與討論...........................................................................36 3-1 紫外光/可見光吸收光譜儀分析..................................36 3-2 液晶相轉移行為之DSC熱分析..................................38 3-3 液晶相轉移行為之POM觀察.....................................40 3-4 液晶混合系統光電特性量測.......................................44 3-4-1 光穿透值量測與灰階特性探討........................44 3-4-2 應答時間量測....................................................47 3-4-3 介電性質量測....................................................48 3-4-3-1 固定頻率，改變溫度介電量測...........49 第四章 結論.......................................................................................57 第五章 參考文獻...............................................................................58

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