Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction

doi:10.7523/j.issn.2095-6134.2005.6.017

›› 2005, Vol. 22 ›› Issue (6): 767-772.DOI: 10.7523/j.issn.2095-6134.2005.6.017

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Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction

SU Yan-Lei, LIU Hui-Zhou

Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

Received:2005-04-04 Online:2005-11-15
Supported by:
supported by Innovation Research Group(No.20221603)and National Nature Science Foundation of China(No.20490200,No.20273075)

Abstract

Abstract:

Changes of microenvironment and micellar properties of poly (ethylene oxide)2poly (propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) block copolymers were investigated on the molecular level.The Fourier transform infrared (FTIR) results showed that quantitative information of micelle structure of PEO-PPO-PEO block copolymer based on the effect of temperature,solvent and composition.Effects of alkali halide salts and aliphatic alcohol upon the thermally induced controlled aggregation of PEO-PPO-PEO block copolymers have been examined by fluorescence spectrum.There is a competition between ether oxygen atoms of the polymer and the ions for available water of hydration,which indirectly weakens the interaction of polymer with water and results in a decrease in the solubility of polymer in water.The extraction capacity of hydrogel is enhanced dramatically by encapsulating PEO-PPO-PEO block copolymers.The alginate hydrogel can be reused through a process of drying,reverse-extraction and regeneration.

Key words: PEO-PPO-PEO block copolymer, FTIR spectroscopy, fluorescence spectroscopy, aggregation behavior, micellar extraction

CLC Number:

O648

SU Yan-Lei, LIU Hui-Zhou. Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction[J]. , 2005, 22(6): 767-772.

References

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Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction

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