Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/3203
標題: 含液晶團基規則樹枝狀高分子之合成及應用
Synthesis and Applications of Dendrons with Peripheral Mesogenic Groups
作者: 鄭景元
Cheng, Ching-Yuan
關鍵字: 規則樹枝狀高分子
Dendron
液晶團基
自組裝
規則蜂窩狀孔洞
Mesogenic groups
Self-assembly
Honeycomb-like porous
出版社: 化學工程學系所
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摘要:   本研究首先合成出具 Smectic C 相之液晶單體 4-(tetradecyloxy)benzoic acid (LC),再加入間隔基成為液晶之衍生物 N-(6-hydroxyhexyl)-4-(tetradecyloxy)benzamide (C6LC),與具高反應性及反應選擇性雙官能基之建構單元 4-isocyanato-4’(3,3-dimethyl-2,4-dioxo-azetidino)diphenylmethane (IDD) 以收斂法合成出末端含液晶團基之規則樹枝狀高分子。利用 FTIR、1H-NMR、MS 及 EA 確定結構正確後,以 TGA 及 DSC 進行熱性質分析,以探討樹枝狀高分子之熱穩定性及相變化溫度。在偏光顯微鏡之觀察下,隨溫度所產生不同之光學紋理,表示分子在不同之溫度下的狀態。   由於樹枝狀高分子骨架所含的 malonamide 鍵結為親水性,而末端液晶分子所含的長碳鏈為疏水性,因此樹枝狀高分子可視為兩性型分子,及分子中所含 amide、urethane、malonamide 及 urea 官能基均可產生強氫鍵作用力,使得樹枝狀高分子有自組裝的現象。將此含液晶團基之樹枝狀高分子當作界面活性劑與 Poly(D,L-lactide) (PLA) 混摻,合適之親疏水比例的分子及適當的降低高分子溶液界面張力,可經 Breath Figure 製程形成規則蜂窩狀孔洞高分子膜。此外,兩性型樹枝狀高分子擁有良好的自組裝特性,甚至無高分子存在下都可形成蜂窩狀孔洞膜。
In this work, a mesogenic monomer with smectic C mesophase, 4-(tetradecyloxy)benzoic acid (LC), and its derivative, N-(6-hydroxyhexyl)-4-(tetradecyloxy)benzamide (C6LC), were synthesized. C6LC was then reacted with a building block, the dual-functional 4-isocyanato-4’(3,3-dimethyl-2,4-dioxo-azetidino)diphenylmethane (IDD) and diethyltriamine, to obtain the dendrons with peripheral mesogenic group via the convergent route. These compounds were first structurally characterized by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectrometer (NMR), mass spectrometer (MS), and elemental analyzer (EA). Subsequently the thermal stability and phase transition temperatures were studied by thermogravimeteric analysis (TGA) and differential scanning calorimeter (DSC) respectively. Optical textures at different temperatures were observed by polarized optical microscope (POM). With the abundant hydrophilic malonamide linkages in the main structure and the hydrophobic long alkyl chains at the periphery, these dendrons could be considered as amphiphiles. Moreover, these dendrons are capable of self-assembling via the strong hydrogen-bonding interactions by the amide, urethane/urea, and malonamide linkages. Therefore, these amphiphilic dendrons as the role of surfactant were blended with poly(D,L-lactide) (PLA). With the proper hydrophilic-hydrophobic balance of molecules and the appropriate reduction of interfacial tension of polymer solution, ordered honeycomb-like porous polymer films could be obtained. Furthermore, the self-assembling amphiphilic dendrons could also bring about porous films without the presence of polymer matrices.
URI: http://hdl.handle.net/11455/3203
其他識別: U0005-2108201322304600
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2108201322304600
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