研究生: |
林聿祥 Yu-Siang Lin |
---|---|
論文名稱: |
不同連接基彎曲形液晶光電物性之探討 The electro-optical study of banana liquid crystal with different linking group and different length of terminal group |
指導教授: |
李俊毅
Jiunn-Yih Lee |
口試委員: |
劉廣定
none 邱士軒 none |
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: | 2005 |
畢業學年度: | 93 |
語文別: | 中文 |
論文頁數: | 93 |
中文關鍵詞: | 彎曲液晶 、反鐵電性質 、介電特性 |
外文關鍵詞: | bent-core liquid crystal, antiferroelectric character, dielectric behavior |
相關次數: | 點閱:209 下載:0 |
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本論文主要為改變彎曲液晶的連接基用以測量物性以及光電性質,這些化合物分別為: (1) 1,3-phenylenebis[4-(4-tetradecanoyl oxybenzoyloxybenzoate(Ba-1) 以及 (2) N,N-bis[4-(4-n-4-tetra decanoyloxybenzoyloxy) Benzylidene] -phenylene-1,3-diamines(Ba-2)。在相變化及液晶紋理觀測方面,主要利用DSC以及偏光式顯微儀觀察相變化及液晶紋理圖,結果顯示其B2相溫度範圍通常維持至20至30℃不等;而相圖可以觀測到Focal-conic-like(風扇狀型態)及Fan-like (拇指狀型態)。
而在光電方面,藉由自發極化測量實驗中,由圖形觀察到兩個尖峰,此結果證明兩種不同連接基之彎曲液晶具有反鐵電性質。
另外我們測量連接基為schife-base或ester彎曲液晶的穿透特性以及應答時間,並測量介電特性來畫出cole-cole plot用以解釋彎曲液晶在電場下時(低頻及高頻)的行為模式為何。
The purpose of study was to changed linking group of bent-core liquid crystal to measure electro-optical character. These compounds were as (1) 1,3-phenylenebis[4-(4-tetradecanoyl oxybenzoyloxybenzoate(Ba-1) and (2) N,N-bis[4-(4-n-4-tetradecanoyloxybenzoyloxy) Benzylidene] -phenylene-1,3-diamines(Ba-2),the phase sequence and transition temperature of compounds in the study were measured by DSC and POM.
In polarization switching experiments, it was proven that bent-core liquid crystal having antiferroelectric character because of double peaks under the application of a triangular-wave electric field. We also discussed the dielectric behavior between high frequency and low frequency in the B2 phase.
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