臺灣博碩士論文加值系統

本研究主要探討溫度對聚亞醯胺(Polyimide，PI)薄膜表面能和對液晶浸潤特性的影響。實驗中會藉由不同的摩擦強度來改變配向膜的表面特性，並在不同的溫度下做探討。在各種不同條件的表面下，利用滴在基板上並達到穩定狀態的液晶來檢測表面的濕潤性，並觀察液晶滴在配向膜上，隨著溫度的增加，液滴的變化情形且會對液晶分子有什麼影響。我們把熱台和接觸角量測系統做結合，量測配向膜的表面能、彌散能及極性能來分析配向膜的表面特性。並量測液晶在不同溫度的接觸角來分析配向膜的浸潤特性。在此實驗中，我們發現配向膜隨著溫度的上升會導致表面能的下降，配向膜上鐵電液晶的接觸角也下降。然而未摩擦配向膜隨著溫度的升高，極性能呈現一個帄穩的曲線，這時鐵電液晶在配向膜上隨溫度升高，接觸角穩定；而摩擦後配向膜隨著溫度升高極性能上升，配向膜上鐵電液晶接觸角則漸漸下降，且在逆摩擦方向的濕潤性比順摩擦方向高。

In this study, we want to realize the influence of temperature and mechanical rubbing on the surface free energy and wettability of liquid crystal(LC) of polyimide(PI) thin films. In different surface conditions, we use the LC that was dropped on to the surface of the sample and become stable to explore the wettability of the surface. We also observe the phenomenon and influence of the LC on the PI with increasing surface temperature. We utilize hot stage and contact angle measuring system to obtain the surface free energy to realize the surface of the PI and measure the contact angle of LC in different temperature to realize the wettability of the PI. We found that the increase of the surface temperature leads to the decrease in the surface free energy of the PI and the contact angle of the FLC on the PI. The increase of the surface temperature causes the stabilization in the surface polar energy and the LC contact angle of the unrubbed PI. But the increase of the surface temperature causes the increase in the surface polar energy and the decrease of the LC contact angle of the rubbed PI. In the anti-parallel-direction to the rubbing direction the rubbed PI exhibits better wettability.

第一章 緒論 1
第二章 理論介紹 3
2-1 液晶介紹 3
2-1-1 中間相(Mesophases) 3
2-1-2 液晶的歷史 4
2-1-3 液晶的分類 6
2-2 液晶物理特性簡介 13
2-2-1 秩序參數 13
2-2-2 各向異性(Anisotropic) 13
2-3 鐵電液晶 15
2-3-1 SmC*相與自發極化向量(Ps) 15
2-3-2 SSFLCD 17
2-3-3 Chevron結構與Zigzag缺陷 18
2-4 配向膜 21
2-5 摩擦配向及強度 22
2-6 表面自由能理論 24
2-6-1 接觸角 24
2-6-2 表面自由能理論 26
2-6-3 變溫表面自由能 29
2-6-4 接觸角延遲量 32
第三章 實驗儀器與方法 33
3-1 材料與儀器介紹 33
3-2 聚亞醯胺薄膜基板製作 36
3-3 實驗量測方法與步驟 39
3-3-1 靜態接觸角量測 39
3-3-2 變溫表面能實驗步驟 41
3-3-3 觀察FLC在PI上升溫過程的現象實驗步驟 41
3-3-4 動態接觸角量測 42
第四章 變溫表面能結果與分析 44
4-1 摩擦次數與變溫表面能 44
4-2 摩擦次數與變溫瀰散能 46
4-3 摩擦次數與變溫極性能 48
4-4 順、逆摩擦方向表面能比較 50
第五章 觀察FLC在PI上升溫過程的現象的結果與分析 52
5-1 PI摩擦與否對FLC順逆接觸角的影響 52
5-2 摩擦次數對FLC順逆接觸角的影響 60
5-3 FLC在PI基板上升溫攤平後的形狀探討 63
5-4 垂直摩擦方向灌注鐵電液晶 66
5-5 桿狀液晶在PI基板上的形狀探討 69
5-6 FLC接觸角與變溫表面能之間的關連探討 71
第六章 結論 73
參考文獻 76

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