收稿日期: 2005-04-04
网络出版日期: 2005-11-15
Aggregation Behavior of PEO-PPO-PEO Block Copolymers and Their Application in Micellar Extraction
Received date: 2005-04-04
Online published: 2005-11-15
Supported by
supported by Innovation Research Group(No.20221603)and National Nature Science Foundation of China(No.20490200,No.20273075)
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。
关键词： PEO-PPO-PEO嵌段共聚物; FTIR光谱; 荧光光谱; 聚集行为; 胶团萃取
苏延磊 , 刘会洲 . PEO-PPO-PEO嵌段共聚物的聚集行为及其在胶团萃取中的应用[J]. 中国科学院大学学报, 2005 , 22(6) : 767 -772 . DOI: 10.7523/j.issn.2095-6134.2005.6.017
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.
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