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研究生： 陳治均
Chen, Chih-Chun
論文名稱： 分子結構對凝膠物性影響-含對苯有機凝膠體之合成與特性探討
Structural Effect on Organogelations and Physical Properties - Synthesis and Characterization of Phenylene Derived Gelators
指導教授： 劉瑞祥
Liu, Jui-Hsiang
學位類別： 碩士
Master
系所名稱： 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年： 2016
畢業學年度： 104
語文別： 英文
論文頁數： 71
中文關鍵詞： 自組裝 、超分子凝膠 、熱穩定度 、液晶 、物理性凝膠
外文關鍵詞： self-assembly, supramolecular gels, thermal stability, liquid crystal, physical gel
相關次數： 點閱：76  下載：1 
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    • 本研究合成兩種具熱可逆性的小分子凝膠體C11和AC11。測試其在各種有機溶劑的凝膠化能力，發現兩凝膠體因結構具有長碳鏈，故皆能有效使多種溶劑凝膠化。由SEM和TEM可觀察乾凝膠(xerogel)下的型態能隨著溶劑不同而改變。以變溫NMR可確認凡德瓦爾力及π-π堆疊作用力對凝膠體形成三維結構的重要性。本研究也測試三種組成下(C11、AC11及1:1混合)的熱穩定度曲線，發現混合多種凝膠體可提升熱穩定度。此外，我們也制備液晶物理性凝膠(Liquid-crystalline physical gel)，以液晶HSG22200為主體混合低濃度凝膠體，形成ㄧ新型材料。由相圖可觀察到C11的相轉移溫度比AC11的低，可歸因於C11較弱的分子間作用力，另外，增加凝膠體的濃度可強化三維結構進而提升熱穩定度。

    Two thermo-reversible organogelators C11 and AC11 were synthesized. The gelation behaviors of synthesized compounds were investigated in various organic solvents, while both of them could gelate lots of solvents due to flexibilities of long carbon chain. The morphologies of gels could be altered through different solvent confirmed by SEM and TEM observations. The temperature-dependent 1H-NMRs verified that van der Waals forces and π-π interactions acted as driving forces leading to gelators self-assembling into three-dimensional networks. To further understand thermal stability and aging effect of gels, plots of Tgel against time elapsed were carried out in a variety of organic solvents in groups of C11, AC11, and equimolar mixture of C11 and AC11, separately. The results suggested that mixing several gelators was probable to elevate thermal properties if there were proper molecular associations. Liquid crystal physical gels were also prepared by mixing liquid crystal HSG22200 and low concentration of gelators and the phase diagrams of mixtures were completed. The Tsol–gels of the mixtures based on C11 were lower than those of the gels based on AC11 gelators, indicating that the interactions among C11 were lower than that of AC11. Besides, increased concentration of gelators resulted in the formation of the network with stronger molecular associations, leading to improved thermal stability preferable for practical uses.

    Abstract I 摘要 II 致謝 III Contents III List of Tables VI List of Figures VII List of Schemes XII I. Introduction 1 1-1 Overview 1 1-2 Research Motivation 2 II. Literature Review 3 2-1 Supramolecular Chemistry 3 2-2 Self-assembly 5 2-3 Introduction of Gels 7 2-4 Low Molecular-Mass Organic Gelators (LMOGs) 9 2-4-1 Alkane Gelators 10 2-4-2 Organic Gelators with One Heteroatom 12 2-4-3 Organic Gelators with Two Heteroatoms 15 2-4-4 Organic Gelators Containing Three Heteroatom Types 16 2-4-5 Polymerizable Organic Gelators 18 2-4-6 Microemulsion-based Gelators 20 2-5 Multi-Component Supramolecular Gels 21 2-6 Liquid-crystalline Physical Gels 24 III. Experimental 32 3-1 Materials 32 3-2 Instruments 34 3-3 Experimental 35 3-3-1 Preparation of gels 37 3-3-2 SEM Sample Preparation 37 3-3-3 TEM Sample Preparation 37 3-3-4 Temperature-dependent 1H-NMR Measurement 37 3-3-5 XRD Sample Preparation 38 3-3-6 Tgel Measurement 38 3-3-7 Preparation of Liquid-Crystalline Physical gels (LC gels) 38 IV. Results and Discussion 40 4-1 Characterization of the Synthesized compounds 40 4-2 Gelation Behaviors of the Synthesized Molecules 44 4-3 Morphology Studies of Organogels 47 4-4 Temperature-Dependent 1H-NMR Analysis 52 4-5 XRD Analysis of Self-Assembled Gels 54 4-6 Gels Stability Analysis 57 4-7 Liquid-Crystalline Physical gels (LC gels) 59 V. Conclusions 66 References 67

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