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| 研究生： |
林宣甫 Lin, Shiuan-Fu |
|---|---|
| 論文名稱： |
添加離子液體對poly(N-vinylpyrrolidone)/十二烷基硫酸鈉水溶液之交互作用機制影響 The effect of addition [BMIM][BF4] in the interaction mechanism of poly(N- vinylpyrrolidone)/SDS system in aqueous solution |
| 指導教授： |
侯聖澍
Hou, Sheng-Shu |
| 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： | 2010 |
| 畢業學年度： | 98 |
| 語文別： | 中文 |
| 論文頁數： | 81 |
| 中文關鍵詞： | 離子液體 、四級銨鹽 、界面活性劑 、高分子 |
| 外文關鍵詞： | ionic liquid, PVP, SDS |
| 相關次數： | 點閱：81 下載：2 |
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在水溶液中高分子（聚N-乙烯吡咯烷酮, PVP），會與陰離子型界面活性劑（十二烷基硫酸鈉, SDS）交互作用，使界面活性劑在較低濃度下（SDS-PVP之cac為2 mM），於高分子線圈上形成類微胞叢集結構，而本研究則是利用pyrene螢光探針法、表面張力與特徵黏度，討論在水溶液中添加親水性離子液體（[BMIM][BF4]），對溶液中SDS-PVP交互作用機制影響，並且比較常用之無機電解質系統與有機電解質系統交互作用機制不同。
研究三成分系統交互作用機制中，當界面活性劑濃度小於cac時，螢光探針與表面張力尚未有急遽轉折現象，認為溶液中之離子液體解離形成[BMIM]+陽離子，並且與陰離子界面活性劑靜電吸引形成離子對。當界面活性劑濃度大於cac，並且SDS/[BMIM][BF4]莫耳比值小於1時，pyrene感受局部疏水區域疏水性增加，代表配對離子液體之界面活性劑疏水作用形成IL-SDS微胞，然而在特徵黏度上則保持固定，代表高分子線圈為自由捲曲狀態，認為離子液體配對之微胞表面帶正電性，而PVP側鏈段具有偶極性之環醯胺基團，會有帶正電之偶極性，使配對微胞與高分子線圈靜電排斥力，配對離子液體之微胞遠離高分子線圈。
當界面活性劑濃度增加使SDS/[BMIM][BF4]莫耳比大於1時，微胞表面配對之離子液體相對比例下降，使微胞表面之正電性密度下降，未與離子液體配對之界面活性劑分子，會與高分子線圈疏水作用，形成SDS-PVP之複合結構，而溶液中存在有IL-SDS緊實結構與SDS-PVP之鬆散結構，pyrene感受之局部疏水性下降。當SDS/[BMIM][BF4]莫耳比大於2.7時，微胞表面離子液體比例大幅下降，配對離子液體之微胞與高分子靜電排斥力下降，使界面活性劑疏水作用於高分子，系統中存在IL-SDS-PVP複合結構，其複合結構內部之疏水性與SDS-PVP複合體相同。
In the past years, the surfactant system of two component species is focused on hydrophobic interactions between polymer and surfactant. In the rescent researchs, the studies at change in the properties of solution upon addition external additive of the two component system of [BMIM][BF4] and SDS. The electrostatic attraction between [BMIM]+ and SDS results in decreased coulombic repulsive interaction between surfactant. In this studies, we focused on the interaction mechanism of three component system of [BMIM][BF4]/SDS/PVP in aqueous solution.
In three components system of [BMIM][BF4]/SDS/PVP, the [BMIM][BF4] competes SDS with PVP. After critical aggregation concentraction, ionic liquid is pairing with surfactant. The pairing ratio of ionic liquid and surfactant is almost at 1：1, by fluorescence techonology. When the object of mole ratio of [BMIM][BF4] and SDS is arrived, the polymer chain is extended from random coil with the increasement of SDS concentraction by specific viscosity. This behavior indicates the pairing ratio is broken and the complexation of the dodecyl sulfate ions into micellar aggregates attached to the polymer.
Besides, the influence of steric hindrance of alkyl chain results in increase in the intermolecular distance between SDS molecules. The surface excess concentraction of SDS decreases as the concentraction of [BMIM][BF4] increases.
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校內：2015-08-04公開校外：2015-08-04公開