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博碩士論文 etd-0620115-145350 詳細資訊
Title page for etd-0620115-145350
論文名稱
Title
因素控制苯-1,3,5-三醯胺液晶之超分子組裝
Factors Controlling the Supramolecular Assembly of Benzene-1,3,5-Tricarboxamide LC
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
103
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2015-07-02
繳交日期
Date of Submission
2015-07-20
關鍵字
Keywords
苯-1,3,5-三醯胺、超分子組裝、液晶、分子間氫鍵、多面體互補作用力
intermolecular hydrogen bonding, benzene-1,3,5-tricarboxylamide, CPI, supramolecular assembly, liquid crystal
統計
Statistics
本論文已被瀏覽 5676 次,被下載 32
The thesis/dissertation has been browsed 5676 times, has been downloaded 32 times.
中文摘要
本論文以合成一系列具有不同側鏈長度的苯-1,3,5-三醯胺之衍生物,並利用偏光顯微鏡(POM)、微差掃描儀(DSC)以及小角度粉末X光繞射儀(XRD)觀測其液晶性質的變化,測試的結果將它定義為六角管柱的液晶。
根據XRD的測試結果顯示,不同的側鏈烷氧基會有不同的排列堆疊,已有文獻報導不同性質的側鏈基會造成苯-1,3,5-三醯胺化合物有不同的晶體排列,這樣的結果歸因於以下兩種作用力的競爭:(i). 羥基與苯環的π-π作用力而減弱分子間的有序性(共平面)。(ii). 分子間三倍的氫鍵作用力造成醯胺官能基與中心苯環有一扭轉角度。
我們更進一步的將醯胺上取代上一個烷基,讓原本自組裝時會產生的分子間氫鍵消失,欲減少原本分子間的空隙,並觀察其對液晶性質的影響,發現這樣的立體阻礙造成較短的側鏈烷氧基無法產生液晶排列。我們也將具有烷基取代的與未取代的混合,以期能夠有良好的多面體互補作用力(CPI),而產生一種新型態的超分子組裝。
Abstract
In this report, we synthesized a series of benzene-1, 3, 5-tricarboxamide derivatives with various peripheral side chain length and investigated their mesogenic properties by POM, DSC, and XRD. The liquid crystalline compounds mesophase was characterized as Colh.
The XRD data reveal different packing of the molecules in relation to the peripheral alkoxy chain length. The nature of the side chains in benzene-1, 3, 5-tricarboxamide has been reported to give different crystal packing, whereby either one of the following forces predominant: (i) pi-pi interactions of carbonyl with aryl without intermolecular order (coplanar) or (ii) 3-fold intermolecular hydrogen bonding whereby the amide has to make a torsion angle with the aryl mean plane.
Furthermore, we envisaged for the first time the alkylation of the amide nitrogen with the hope of reducing the void in the packing, and tuning the mesogenic properties. The steric effect was found to be important, making the short alkoxy peripheral chain not liquid crystalline. We also mixed the alkylated amide with the no-alkylated amide compound with the hope of good CPI interaction r and the formation of a new supramolecular assembly.
目次 Table of Contents
論文審定書 i
謝誌 ii
摘要 iv
Abstract v
第一章 1
1-1前言 1
1-2 液晶的分類與性質介紹 2
1-2-1 性質介紹 2
1-2-2 液晶分類 4
1-3 文獻回顧 9
1-3-1 成核試劑之應用 11
1-3-2 有機凝膠之應用 12
1-3-3 MRI顯影試劑之應用 14
1-3-4 微膠囊之應用 15
1-3-5 液晶材料之應用 16
1-4 分子間氫鍵 21
1-5 玻璃態 23
1-6 多面體互補作用力 24
第二章 實驗部分 25
2-1 研究動機 25
2-2合成策略 27
2-2-1 苯-1,3,5-三醯胺化合物合成歷史 27
2-2-2 合成步驟探討 28
系列一. Triamide-Cn-NH 28
系列二 Triamide-Cn-NCH3 29
第三章 結果與討論 31
3-1 物理性質探討 31
3-1-1 系列一 Triamide-Cn-NH 31
3-1-2 系列二 Triamide-Cn-NCH3 42
3-1-3 系列二 Triamide-C8-mixture 50
第四章 結論 53
第五章 實驗步驟 54
參考文獻 69
附錄 73
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