Effect of acid on the aggregation of poly(ethylene xide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers |
| |
| Authors: | Yang Bin Guo Chen Chen Shu Ma Junhe Wang Jing Liang Xiangfeng Zheng Lily Liu Huizhou |
| |
| Institution: | Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institution of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, China. |
| |
| Abstract: | The acid effect on the aggregation of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) block copolymers EO(20)PO(70)EO(20) has been investigated by transmission electron microscopy (TEM), particle size analyzer (PSA), Fourier transformed infrared, and fluorescence spectroscopy. The critical micellization temperature for Pluronic P123 in different HCl aqueous solutions increases with the increase of acid concentration. Additionally, the hydrolysis degradation of PEO blocks is observed in strong acid concentrations at higher temperatures. When the acid concentration is low, TEM and PSA show the increase of the micelle mean diameter and the decrease of the micelle polydispersity at room temperature, which demonstrate the extension of EO corona and tendency of uniform micelle size because of the charge repulsion. When under strong acid conditions, the aggregation of micelles through the protonated water bridges was observed. |
| |
| Keywords: | |
| 本文献已被 PubMed 等数据库收录！ |
|
