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| 研究生： |
李爾生 Neil - Alvin S. Cala |
|---|---|
| 論文名稱： |
Ostwald Ripening Rate of Two-Component Miniemulsion Systems Ostwald Ripening Rate of Two-Component Miniemulsion Systems |
| 指導教授： |
陳崇賢
Chorng-Shyan Chern |
| 口試委員: |
黃延吉
Huang Yan-Ji 許榮木 Hsu Jung-Mu |
| 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： | 2008 |
| 畢業學年度： | 96 |
| 語文別： | 英文 |
| 論文頁數： | 93 |
| 外文關鍵詞： | Miniemulsion Stability |
| 相關次數： | 點閱：137 下載：2 |
| 分享至: |
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The effect of varying the costabilizer volume fraction on the Ostwald ripening rate of various two-component miniemulsion systems comprising of either methyl methacrylate (MMA) or styrene (STY) as monomers, stabilized by either lauryl methacrylate (LMA) or stearyl methacrylate (SMA) was investigated. The Ostwald ripening rate was found to decrease with increasing costabilizer content in the monomer mixture. Systems stabilized by the more hydrophilic LMA show higher Ostwald ripening rates as compared to systems stabilized by SMA.
It was found that the Ostwald ripening rate follow Kabalnov’s equation 1/ω = φ1/ω1 + φ2/ω2 only at low costabilizer volume fractions, deviating significantly as the costabilizer volume fraction is increased. An empirical equation 1/ω = 1/ω1*(1+K1φ2+K2φ22) was fitted into the experimental values of the Ostwald ripening rate. This gave satisfactory values of the coefficient of determination (R2). The effect of varying the finite disperse phase volume fraction on the Ostwald ripening rate was also studied. It was shown that changing the volume fraction of the disperse phase does alter the Ostwald ripening rate.
The effect of varying the costabilizer volume fraction on the Ostwald ripening rate of various two-component miniemulsion systems comprising of either methyl methacrylate (MMA) or styrene (STY) as monomers, stabilized by either lauryl methacrylate (LMA) or stearyl methacrylate (SMA) was investigated. The Ostwald ripening rate was found to decrease with increasing costabilizer content in the monomer mixture. Systems stabilized by the more hydrophilic LMA show higher Ostwald ripening rates as compared to systems stabilized by SMA.
It was found that the Ostwald ripening rate follow Kabalnov’s equation 1/ω = φ1/ω1 + φ2/ω2 only at low costabilizer volume fractions, deviating significantly as the costabilizer volume fraction is increased. An empirical equation 1/ω = 1/ω1*(1+K1φ2+K2φ22) was fitted into the experimental values of the Ostwald ripening rate. This gave satisfactory values of the coefficient of determination (R2). The effect of varying the finite disperse phase volume fraction on the Ostwald ripening rate was also studied. It was shown that changing the volume fraction of the disperse phase does alter the Ostwald ripening rate.
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