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)

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

从分子水平研究了PEO-PPO-PEO嵌段共聚物聚集过程中分子基团微环境和构象的变化.FTIR光谱给出了温度、溶剂、嵌段共聚物组成等影响PEO-PPO-PEO嵌段共聚物胶团结构的定量信息.用无机盐和脂肪醇调控PEO-PPO-PEO嵌段共聚物聚集,荧光光谱技术提供了降低PPO链段与水的相互作用,推动嵌段共聚物在水中胶团化的证据.用水凝胶包埋PEO-PPO-PEO嵌段共聚物,实现了萃取水中低浓度多环芳烃的工艺循环.

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.