混合型共同安定劑(LMA/n-Alkane)對苯乙烯迷你乳液之奧斯瓦老化效應的影響

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研究生：	蘇彗佳 Putu - Mas Satvika Ganitri
論文名稱：	混合型共同安定劑(LMA/n-Alkane)對苯乙烯迷你乳液之奧斯瓦老化效應的影響 Effects of Mixed Costabilizers on the Ostwald Ripening of Styrene Miniemulsion : LMA/n-Alkane
指導教授：	陳崇賢 Chorng-Shyan Chern
口試委員:	林析右 Shi-Yow Lin 許榮木 Jung-Mu Hsu
學位類別：	碩士 Master
系所名稱：	工程學院 - 化學工程系 Department of Chemical Engineering
論文出版年：	2012
畢業學年度：	100
語文別：	英文
論文頁數：	179
中文關鍵詞：	迷你乳液、奧士瓦老化速率、混合型共同安定劑、甲基丙烯酸十二酯、正烷烴
外文關鍵詞：	Miniemulsions, Ostwald Ripening, Mixed Costabilizers, LMA, n-Alkanes
相關次數：	點閱：138 下載：4
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上一筆

包括苯乙烯（St）為單體的細乳液系統Ostwald熟化率，無論是單一的costabilizer十二烷基甲基丙烯酸酯（LMA）和各種正構烷烴（癸，十二烷，十六烷和四烷）或混合型喉罩/穩定costabilizer濃度的影響正構烷烴進行了調查。。準備使用表面活性劑（SDS）和喉罩或混合喉罩/正烷烴和使用sonicator均質分散在水中的ST miniemulsions。 Ostwald熟化率的數據，只能跟著Kabalnov低costabilizer體積分數方程。在更高的costabilizer體積分數，他們偏離作為的costabilizer體積分數增加顯著。經驗公式1/Ro=1/Ro1（1+K1φ2+K2φ22）Ostwald熟化率的實驗數據擬合。 K1的值是ST/罩（9.98×104），ST/癸烷（4.49×104），ST/十二烷（1.30×105），ST/十六烷（3.45×105）和ST /四烷（4.16×105）。
阻燃Ostwald熟化易出現三個組成部分的LMA和n-烷烴的混合costabilizers在驅散相單體miniemulsions的作用進行了研究。改良Kabalnov方程失敗來形容Ostwald熟化行為。因此，分散細乳液的階段，包括單體ST和LMA和n-烷烴mised costabilizers只是作為一個偽雙組分分散處理相細乳液體系。所有的結果是自洽的一證明擬議偽兩個組件的有效性分散相細乳液聚合模型。在這項研究中觀察到的一個獨特功能是協同作用在延緩Ostwald熟化過程中的混合cotabilizers，LMA和n-烷烴效果。在混合costabilizer LMA和正構烷烴被發現的長鏈正構烷烴，從方程（1/R0，cmix= fLMA/R0，LMA+（1 fLMA）/ R0的，正烷烴的協同作用效果的偏差）。

The effect of costabilizer concentration on the Ostwald ripening rate of miniemulsion systems comprising Styrene (ST) as monomers, and stabilized by either single costabilizer Lauryl Methacrylate (LMA) and various n-Alkane (Decane,Dodecane,Hexadecane and Tetracosane) or mixed LMA/ n-Alkane was investigated. . The miniemulsions were prepared by dispersing ST in water using surfactant (SDS) and either LMA or mixed LMA/n-Alkane and to homogenize using sonicator. The Ostwald ripening rate data only follow Kabalnov’s equation at low costabilizer volume fractions. At higher costabilizer volume fractions, they deviated significantly as the costabilizer volume fraction was increased. An empirical equation 1/Ro = 1/Ro1(1+K1φ2+K2φ22) was fitted into the experimental data of the Ostwald ripening rate. The K1 values obtained are ST/LMA (9.98 x 104), ST/Decane (4.49 x 104), ST/Dodecane (1.30 x 105), ST/Hexadecane (3.45 x 105) and ST/Tetracosane (4.16 x 105).
The role of mixed costabilizers of LMA and n-Alkane in retarding Ostwald ripening occuring three-component disperse phase monomer miniemulsions was investigated. The modified Kabalnov equation failed to describe the Ostwald ripening behavior. Thus , the miniemulsion disperse phase comprising monomer ST and the mised costabilizers of LMA and n-Alkane was simply treated as a pseudo-two-component disperse phase miniemulsion system. All the results that are self-consistent with one another justify the validity of the proposed pseudo-two component disperse phase miniemulsion model. A unique feature observed in this study is the synergitic effect of the mixed cotabilizers of LMA and n-Alkane in retarding the Ostwald ripening process. In mixed costabilizer LMA and n-Alkane was found that the longer chain of n-Alkane shown a deviation from the synergitic effect equation (1/R0,cmix = fLMA/R0,LMA + (1-fLMA)/R0,n-Alkane ).

ACKNOWLEDGEMENT 	                                         i
	TABLE OF CONTENTS	                                        ii
	LIST OF FIGURES	                                                iv
	LIST OF TABLES	                                               vii
	ABSTRACT	                                              viii

Chapter I Introduction	                                                 1
1.1	Emulsion	                                                 1
1.2	Emulsion Stability	                                         2
1.3	Miniemulsion	                                                 3
1.4	About this Research	                                         4

Chapter II Literature Survey	                                         6
2.1	Miniemulsion Stability	                                         6
2.2	Preparation of Miniemulsions	                                 9
	2.2.1 Formulation	                                         9
	2.2.2 Method of Preparation	                                11
2.3	Ostwald Ripening Rate	                                        14


Chapter III Experimental	                                        31
3.1	Chemicals	                                                31
3.2	Equipments	                                                31
	3.2.1 Major Equipment	                                        31
	3.2.2 Others Equipments Used	                                32
	3.2.3 Apparatus Used 	                                        32
3.3	Experimental Procedure	                                        32
	3.3.1 Preparation of Miniemulsion	                        32
	3.3.2 Miniemulsion with two costabilizer 	                33
	3.3.3 Measurement of Monomer Droplet Size or Latex Particle Size by Dynamic Light Scattering (DLS)	                                        34
	3.3.4 Formulation of dilution solution	                        34
3.4	Schematic Diagram of Experimental Procedure	                36
3.5	Experimental Set-up	                                        38



Chapter IV Result and Discussion	                                44
4.1	Miniemulsion Stability	                                        44
	4.1.1 Monomer Droplet Degradation upon Aging	                44
	4.1.2 Effect of Monomer Composition on Ostwald Ripening Rate	46
	4.1.3 Modelling of the Experimental Data	                52
4.2	Miniemulsion system with mixed two costabilizers	        56
4.3	Mechanism of Ostwald Ripening	                                73

Chapter V Conclusion	                                                78
References	                                                        80
Appendix Raw Data	                                                82

                                

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