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研究生: 余福恩
Fu-en Yu
論文名稱: 半批式MMA/2-EHA乳化聚合反應混合界面活性劑與抗電解質性能關係
Semibatch MMA/2-EHA Emulsion Polymerization the Relation between Surfactants and Performance in Resisting Externally Added Electrolytes
指導教授: 陳崇賢
Chorng-Shyan Chern
口試委員: 黃延吉
Yan-Jyi Huang
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: 2009
畢業學年度: 97
語文別: 中文
論文頁數: 52
中文關鍵詞: 乳化聚合抗電解質界面活性劑臨界凝聚濃度
外文關鍵詞: critical coagulation concentration
相關次數: 點閱:243下載:2
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  • 本論文是使用半批式MMA/2-EHA乳化聚合反應,並使用混合陰離子型與非離子型界面活性劑保護乳漿粒子,藉由加入Mg2+來觀察乳漿粒子抗電解質性能。由於陰離子型界面活性劑對於外加陽離子非常敏感,所以非離子型界面活性劑在乳漿抗電解質性能中扮演著重要的角色,且Mackor理論預測,非離子型界面活性劑對於乳漿的保護能力隨著其鏈長增加而加強,實驗結果顯示,乳漿的抗電解質能力的確隨非離子型界面活性劑的用量增加而增加,不過由於半批式製程對於粒徑控制的影響與外加陽離子對於粒徑的改變過程都和不同非離子型界面活性劑的鏈長相關,在粒徑變化導致粒子表面界面活性劑密度改變的影響之下,我們發現對於粒子保護能力較差的短鏈型非離子型界面活性劑在控制乳漿粒子的臨界凝聚濃度(critical coagulation concentration,C.C.C.)卻有較佳的表現。這樣的發現與以往的認知有很大的衝擊對於日後相關的乳化聚合製程設計也提供了不同的想法。


    The objective of this work was to prepare polymer colloids via semi-batch MMA/2-EHA emulsion polymerization with mixed anionic and nonionic surfactants . The chemical stability of latexes toward added Mg2+ was investigated . It is well known that the anionic surfactant is very sensitive to cation and the nonionic surfactant is the major component used to resist the externally added electrolytes . Mackor theory predicts that the steric stabilization increases with increasing the adsorbed polymer chain length and the number of adsorbed sites per unit surfact area . however the experimental results show that the chemical stability of latexes toward added electrolytes in the best for the polymerizations with the nonionic surfactant with the shortest PEG chain length . This is primarily due to the secondary particle nucleation process occurring in the polymerizations nonionic surfactants with longer PEG chain length , there by leading to larger total particle surface area and smaller particle surface PEG density .

    中文摘要……………………………………………………………………... Ⅰ 英文摘要……………………………………………………………………... Ⅱ 誌謝…………………………………………………………………………... Ⅲ 目錄…………………………………………………………………………... Ⅳ 圗表索引……………………………………………………………………... Ⅴ 第一章 緒論 1.1 乳化聚合反應…………………………………………………………… 1 1.2 研究範疇………………………………………………………………… 3 第二章 文獻回顧 2.1 乳化聚合反應的成核機構……………………………………………… 4 2.2 乳液安定性……………………………………………………………… 8 2.3 維持安定性的機構……………………………………………………… 9 2.4 其它文獻………………………………………………………………… 13 第三章 實驗儀器與實驗程序 3.1 實驗藥品………………………………………………………………… 15 3.2 實驗儀器………………………………………………………………… 16 3.3 實驗程序………………………………………………………………… 17 第四章 結果與討論 4.1 非離子型界面佸性劑濃度對C.C.C.的影響…………………………… 20 4.2 不同鏈長非離子型界面佸性劑對C.C.C.的影響……………………… 27 4.3 非離子型界面佸性劑鏈長的效應……………………………………… 35 第五章 結論與建議 5.1 結論……………………………………………………………………… 38 5.2 建議……………………………………………………………………… 39 參考文獻……………………………………………………………………... 41

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