Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction
PEO–PPO–PEO嵌段共聚物的聚集行为及其在胶团萃取中的应用（英文）

Changes of microenvironment and micellar properties of poly(ethylene oxide)-poly(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.