| 椰油丙基酰胺甜菜碱/聚乙二醇水溶液的分相研究 |
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| 引用本文： | 游晓艳,秦炜,戴猷元.椰油丙基酰胺甜菜碱/聚乙二醇水溶液的分相研究[J].中国化学工程学报,2009,17(5):746-749. |
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| 作者姓名： | 游晓艳 秦炜 戴猷元 |
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| 作者单位： | State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| 摘 要： | Phase separation behavior of cocamidopropyl betaine/water/polyethylene glycol (PEG) system was studied. The effects of concentration and molecular weight of PEG on the phase separation behavior were investigated. Clouding occurred when the con-centration of PEG was large enough in the betaine aqueous solution, and the concentration of PEG at cloud point decreased with the increase of PEG molecular weight for a constant betaine concentration. The bottom phase was the PEG-rich phase, and the upper phase was the betaine-rich phase. The volumetric ratio of PEG-rich phase to betaine-rich phase, at the same difference between the PEG concentration and the one at the cloud point, Ccp (0.1 g•ml－1), decreased as the PEG molecular weight increased and approached 1 for higher PEG molecular weight (about 20000), which was similar to the typical aqueous two-phase system. This volumetric ratio depended on the initial PEG concentration, but independent of PEG molecular weight. The concentration ratio of betaine to PEG in both phases depended on the Ccp, independent of PEG molecular weight.
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| 关 键 词： | phase behavior cocamidopropyl betaine polyethylene glycol |
| 收稿时间： | 2008-12-10 |
| 修稿时间： | 2009-5-25
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Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System |
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| YOU Xiaoyan,QIN Wei,DAI Youyuan.Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System[J].Chinese Journal of Chemical Engineering,2009,17(5):746-749. |
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| Authors: | YOU Xiaoyan QIN Wei DAI Youyuan |
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| Affiliation: | State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Phase separation behavior of cocamidopropyl betaine/water/polyethylene glycol (PEG) system was studied. The effects of concentration and molecular weight of PEG on the phase separation behavior were investigated. Clouding occurred when the concentration of PEG was large enough in the betaine aqueous solution, and the concentration of PEG at cloud point decreased with the increase of PEG molecular weight for a constant betaine concentration. The bottom phase was the PEG-rich phase, and the upper phase was the betaine-rich phase. The volumetric ratio of PEG-rich phase to betaine-rich phase, at the same difference between the PEG concentration and the one at the cloud point, ΔC_(cp) (0.1 g·ml~(-1) ), decreased as the PEG molecular weight increased and approached 1 for higher PEG molecular weight (about 20000), which was similar to the typical aqueous two-phase system. This volumetric ratio depended on the initial PEG concentration, but independent of PEG molecular weight. The concentration ratio of betaine to PEG in both phases depended on the ΔC_(cp), independent of PEG molecular weight. |
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| Keywords: | phase behavior cocamidopropyl betaine polyethylene glycol |
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