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系統識別號 U0026-0812200911592910
論文名稱(中文) 高分子電解質/界面活性劑混合單分子膜在氣液界面行為的研究
論文名稱(英文) Studies on the Behaviors of Mixed Polyelectrolyte/Surfactant Monolayer at the Air/Water Interface
校院名稱 成功大學
系所名稱(中) 化學工程學系碩博士班
系所名稱(英) Department of Chemical Engineering
學年度 94
學期 2
出版年 95
研究生(中文) 柯泰年
研究生(英文) Tai-Nian Ke
學號 n3693114
學位類別 碩士
語文別 中文
論文頁數 82頁
口試委員 口試委員-徐文平
口試委員-楊毓民
指導教授-李玉郎
口試委員-陳炳宏
口試委員-張鑑祥
中文關鍵字 氣/液界面  高分子電解質  原子力顯微鏡  LB膜 
英文關鍵字 Polyelectrolyte  Atomic force microscope (AFM)  LB film  Air/water interface 
學科別分類
中文摘要 本實驗主要是利用靜電吸引力將具有相反電性的高分子電解質與界面活性劑相互吸引,使水溶性的高分子電解質疏水化,並在氣/液界面上形成穩定的單分子膜。利用界面活性劑的添加來疏水化高分子電解質的方法有二:方法一是將高分子電解質的粉末和界面活性劑的粉末直接分散於溶劑(氯仿/甲醇(v/v)=7/3)中再灑於氣/液界面;而方法二則先混合兩者的水溶液,藉兩者間的靜電作用力產生疏水性的沉澱物。將此沉澱物清洗、烘乾後分散於氯仿中再用以製備單分子膜。在本文中我們將探討界面活性劑的添加量、疏水尾基的長度、及不同的混合方法對混合單分子膜在氣/液界面上的行為的影響。
在π-A等溫線的實驗裡,發現在方法一裡,疏水化之後的高分子電解質可以存在於氣/液界面上,並且會隨著界劑添加量的增加而向右偏移。而等溫線的崩潰壓會隨著所添加之界劑碳鏈長度的增長而提高。而在方法二中,單分子膜並不會因為界劑的改變而有所偏移。由兩個方法的等溫線來看,利用方法二混合的單分子膜延展性會比方法一好。遲滯曲線實驗發現混合單分子膜有良好的再分散性。鬆弛曲線則發現穩定性大致上良好,而且穩定性會隨著界劑碳鏈的增加而增加。原子力顯微鏡的觀察發現方法一中polystyrene sulfonate(PSS)/Octyltrimethylammonium bromide(C8TMAB)系統會形成許多坑洞,而當界劑碳鏈增加為14個碳(Tetradecyltrimethylammonium bromide, C14TMAB)時坑洞便形成較平整的膜,而碳鏈增加到18個碳(Octadecyltrimethylammonium bromide, C18TMAB)時,高界劑比例會有明顯的聚集產生。經由粗糙度(RMS)的分析證明,界劑添加量增加會造成單分子膜粗糙度的增加。此現象在PSS/C18TMAB系統尤其明顯。



英文摘要 In this study, polystyrene sulfonate (PSS) was hydrophobized by electrostatic attracting with oppositely charged surfactant, and forms a stable monolayer at the air/water interface. Two methods were used to hydrophobize the polyelectrolyte. The first is by co-spreading the mixed polyelectrolyte/surfactant solution on the subphase. The second is by pre-precipitating the mixture of polyelectrolyte and surfactant in aqueous solution and then spreads the precipitate at the air/water interface by dissolving first in a spreading solvent. The effects of the two methods, as well added amount of surfactant and the chain length of surfactant, on the behavior of the mixed polyelectrolyte/surfactant monolayer at the air/water interface are studied. The experimental results show that, through the incorporation of surfactants, PSS can form stable monolayers with high re-spreading characteristic. For the first method, the mixed monolayer becomes more extended when more amount of surfactant was added and approaches a maximum extended state at specific molar ratios dependent on the chain length of surfactants. Besides, the stability and collapse pressure of the mixed monolayer are higher when a long-chain surfactant is used. For the second method, the extensibility of the monolayer is better than that of method one, and is independent of the surfactant used. The surface morphology of the mixed LB films were analyzed by atomic force microscopy. Empty holes are found on LB film prepared from PSS/octyltrimethylammonium bromide(C8TMAB). The LB film becomes uniform when the surfactant chain length increases to 14 (C14TMAB), and aggregations appear when a longer surfactant (C18TMAB) is used.


論文目次 摘要 I
Abstract III
致謝 V
目錄 VI
圖目錄 IX
表目錄 XIV
第一章 緒論 1
1-1 前言 1
1-2 研究動機 2
第二章 文獻回顧 3
2-1 Langmuir 單分子層的形成 3
2-2 Langmuir單分子層的相變化 3
2-3 Langmuir單分子層的穩定性 5
2-4 Langmuir單分子層的遲滯現象 5
2-5 Langmuir-Blodgett(LB)膜的製備 6
2-6 高分子電解質 7
2-7 高分子電解質薄膜 8
2-8 高分子電解質/界面活性劑混合系統 9
第三章 實驗 14
3-1 實驗材料與藥品 14
3-2 實驗裝置與測量原理 15
3-2-1 Langmuir槽 15
3-2-2 表面電位儀 15
3-2-3 元素分析(EA) 17
3-2-4 原子力顯微鏡(AFM) 18
3-3 實驗步驟 18
3-3-1 配製樣品 18
3-3-2 單分子層實驗 19
3-3-3 LB膜的製備 21
3-3-4 原子力顯微鏡的測量 21
第四章 結果與討論 28
4-1 方法二中混合沉澱物的組成 28
4-2 單分子層的等溫線行為 28
4-2-1表面壓-重複單位佔據面積(π-A)等溫線的行為 28
4-2-2表面電位-重複單位佔據面積(ΔV-A)等溫線的行為 31
4-3 單分子層的鬆弛行為 33
4-4 單分子層的遲滯行為 34
4-5 LB膜的表面型態 36
第五章 結論與建議 74
5-1 結論 74
5-2 建議 75
參考文獻 76
自述 82

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