English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 64745/64745 (100%)
造訪人次 : 20464196      線上人數 : 381
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋


    請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/5918


    題名: 無機桿狀液晶之設計與探討;Inorangic rod liquid crystals
    作者: 劉和治;Ho-chih Liu
    貢獻者: 化學研究所
    關鍵詞: 桿狀液晶;rod liquid crystals
    日期: 2003-06-20
    上傳時間: 2009-09-22 10:10:20 (UTC+8)
    出版者: 國立中央大學圖書館
    摘要: 摘 要 本論文主要是探討,以benzoxazoles為主要中心core的液晶材料設計與物性。利用NMR來鑑定分子結構,元素分析來測量其純度。此外,並利用熱差掃瞄卡計(DSC),powder X-ray,偏光顯微鏡,觀察其液晶相變化與分子排列情形。 在系列一之有機液晶分子結構中,我們固定較難合成的2-amino -5-dodecyloxyphenol側鏈碳數(n=12),只改變另一邊側鏈基碳數,當n=1、4、6、8、10、12與14,具有SmC及N的液晶相。另外,我們也試著改變此有機液晶,將其單邊側鏈基由1根增加為2根及3根,但並沒有液晶相之形成。接著,我們也將此有機液晶分子,試著與金屬Pd配位。結果,我們雖然能成功地與金屬配位,但卻未能形成無機液晶。 將系列一的有機液晶分子結構稍做變化,而形成系列二的配位基。我們仍然固定2-amino-5-dodecyloxyphenol這一邊的側鏈碳數(n=12)。接著,我們將合成出來的配位基4-alkoxybenzoic acid 4-(6-dodecyloxybenzooxazol-2-yl)-3-hydroxyphenyl ester與金屬(M=Zn) 進行配位,得到具有液晶性質之含單金屬無機液晶。接著,我們將配位基與金屬Cu和Pd進行錯合時,並不具有任何液晶相。 Abstract Numerous known examples of hydrocarbon structures, used as core groups exhibiting columnar phases have been reported. However, examples of heterocyclic structures used as core groups are relatively less. The presence of nitrogen, sulfur or oxygen atoms on these heterocyclic rings, which likely introduce a transverse dipole moment often resulted in a change in dielectric anisotropy. The formation of liquid crystallinity in such heterocyclic compounds might be facilitated by weak p - p interaction between these aromatic or heterocyclic rings. In this work a new type of heterocyclic compounds, 4-alkoxybenzoic acid 4-(6-alkoxy benzoxazol-2-yl)phenyl esters, in which an unsaturated benzoxazole ring was utilized as the rigid core group, were prepared and their mesomorphic properties studied. All compounds were characterized by 1H-, 13C-NMR spectroscopy, powder X-ray diffraction and the mesomorphic properties of these compounds were studied by DSC analysis, optical polarized microscope and powder XRD diffraction. The results indicated that these rod-like compounds exhibited nematic (N) and smectic (SmC) phases. The range of mesophase temperatures was slightly dependent on the ratio of width-to-length (d/l, i.e., aspect ratio) of the molecular shape.
    顯示於類別:[化學研究所] 博碩士論文

    文件中的檔案:

    檔案 大小格式瀏覽次數
    0KbUnknown488檢視/開啟


    在NCUIR中所有的資料項目都受到原著作權保護.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回饋  - 隱私權政策聲明