研究生: |
蘇鴻濱 Hung Pin Su |
---|---|
論文名稱: |
高分子薄膜表面型態與液晶配向膜定向摩擦之特性研究 The Alignment Properties of Liquid Crystal Molecules between Rubbed Polyimide Surfaces |
指導教授: |
楊長謀博士
A.C.-M. Yang |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
工學院 - 材料科學工程學系 Materials Science and Engineering |
論文出版年: | 2001 |
畢業學年度: | 89 |
語文別: | 中文 |
論文頁數: | 110 |
中文關鍵詞: | 聚亞醯胺 、光學各向異性 、預傾角 、配向膜 、原子力顯微鏡 、分子鏈排列 |
外文關鍵詞: | Liquid crystal, polyimides, birefringence, Atomic force microscopic, pretilt angle |
相關次數: | 點閱:2 下載:0 |
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液晶顯示器中液晶分子配向方式與高分子薄膜材料的特性、高分子薄膜配向處理,都有著密切的關係,這些特殊的配向技術不僅在製作液晶元件方面,也在基礎的高分子薄膜表面物理機制有其重要性。雖然這配向技術已被廣泛的應用在液晶光電產業,但是,液晶分子與配向膜表面間之配向機構尚眾說紛紜未有明確的理論。
本論文主要想瞭解定向摩擦配向膜而造成定向排列之配向膜表面與物理機構。利用不同特性的高分子薄膜,並採用旋轉鍍膜法(spin-coating)製作高分子均勻薄膜,分別以原子力顯微鏡研究高分子薄膜PPO、互溶性高分子PS/PPO混合物以及聚亞醯胺以旋鍍法製成之薄膜在剛製備完成及受力拉伸、形變之形貌,並且探討聚亞醯胺膜受到外力摩擦時所呈現出的表面型態以及所造成的光學各向異性(Optical Anisotropy)的現象,進一步研究高分子鏈在薄膜內排列情況以及期望研究對預傾角之影響和液晶分子配向排列之機制作更進一步的瞭解。
根據我們的實驗結果顯示:(1)在奈米尺度下均勻溶液所旋鍍出的PPO、PS/PPO混合物薄膜並不是均勻平坦的,事實上,其表面有許多奈米級的pinholes產生,且伴隨所謂的“nodule structure”。(2)定向摩擦的聚亞醯胺表面,摩擦後的聚亞醯胺膜表面呈現出許多細微的溝槽沿著摩擦方向規則地排列;摩擦後的表面光學相遲滯的現象,隨著摩擦次數漸增而增加。(3)定向摩擦造成液晶分子定向排列最主要的原因是由於配向膜分子鏈之旋轉重排,並非因摩擦配向膜所產生的微細溝槽造成。並藉由實驗的結果推導出一簡單的方式來計算出預傾角的大小。
The microscopic surface and physical mechanism generation in nematic liquid crystalline 5CB (4-n-pentyle-4’-cyanobiphenyl) on three kinds of rubbed polyimide surfaces were investigated. We compare different rubbing configurations with respect to their rubbing work, the resulting plastic deformation of the surface, and the homogeneity of the liquid crystalline alignment. The orientation of liquid crystalline molecules on rubbed polymer surfaces is characterized by the physical and chemical properties of the polymer and liquid crystalline material as well as by the coating and rubbing technique used. The effect of the rubbing work applied to polymer-coated substrates on the birefringence was AL-1051 (0.103)>AL-8044 (0.094) > PMDA- ODA (0.085) or the oriented birefringence was AL-1051 (0.100)>AL-8044 (0.092) >PMDA-ODA (0.083). Atomic force microscopy was utilized to investigate the surface conformation of the three-polyimide alignment layers before and after rubbing. With increasing rubbing strength, the molecular alignment varied greatly. The director of molecules with positive dielectric anisotropy was uniform and had a pretilt angle determined by the molecular structure. The simple method enabled us to give the value of pretilt angle.
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