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 .
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