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Citation: SHI Chang-Yun, WANG Yun-Dong, DAI You-Yuan, GAN Guan. Reverse Micelle Formation and Thermodynamic Behavior of PEO-PPO Triblock Copolymers[J]. Chinese Journal of Applied Chemistry, ;2000, 17(6): 581-584. shu

Reverse Micelle Formation and Thermodynamic Behavior of PEO-PPO Triblock Copolymers

1.
a Department of Chemical Engineering, Tsinghua University, Beijing 100084;
b Department of Chemical Engineering, The Queen's University of Belf ast, Bel fast, Northern Ireland, U.
b Department of Chemical Engineering, The Queen's University of Belfast, Belfast, Northern Ireland, U. K.

Received Date: 27 April 2000
Available Online: 17 August 2000
Fund Project: 国家自然科学基金资助项目(29836130) (29836130)

The effects of temperature on the copolymer micellization in octanol-xylene and on the solubilization of water are examined for poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)(PE6200) and poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide)(25R4) copolymers. The "reverse" critical micelle concentrations(CMC) are determined. An increase in temperature favours the solubilization of copolymers in organic solvent, resulting in an increase of CMC of the copolymers. A linear relationship between ln X_CMC and absolute temperature is observed, from which some thermodynamic parameters of the micellization are estimated. The negative ΔG_ps⁰ indicates that thermodynamically stable micelles are formed spontaneously by the block copolymers in octanol-xylene. The ΔH_ps⁰ and ΔS_ps⁰ values are also negative, showing that the formation of micelles in p-xylene is exothermic and entropically unfavorable.
- triblock copolymer reverse micellization,
- water solubilization,
- CMC,
- thermo-dynamic behavior
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