Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System

›› 2009, Vol. 17 ›› Issue (5): 746-749.

Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System

游晓艳, 秦炜, 戴猷元

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2008-12-10 修回日期:2009-05-25 出版日期:2009-10-28 发布日期:2009-10-28
通讯作者: QIN Wei,E-mail:qinwei@tsinghua.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20676069)

Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System

YOU Xiaoyan, QIN Wei, DAI Youyuan

State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2008-12-10 Revised:2009-05-25 Online:2009-10-28 Published:2009-10-28
Supported by:
Supported by the National Natural Science Foundation of China (20676069)

摘要/Abstract

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 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.

关键词: phase behavior, cocamidopropyl betaine, polyethylene glycol

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.

Key words: phase behavior, cocamidopropyl betaine, polyethylene glycol

游晓艳, 秦炜, 戴猷元. Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System[J]. , 2009, 17(5): 746-749.

YOU Xiaoyan, QIN Wei, DAI Youyuan. Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System[J]. , 2009, 17(5): 746-749.

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Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System

Phase Separation Behavior of Cocamidopropyl Betaine/Water/Polyethylene Glycol System

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